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J. Semicond. > 2022, Volume 43 > Issue 11 > 110202

RESEARCH HIGHLIGHTS

Improving reverse intersystem crossing of MR-TADF emitters for OLEDs

Xufeng Luo1, Lixiu Zhang2, Youxuan Zheng1, and Liming Ding2,

+ Author Affiliations

 Corresponding author: Youxuan Zheng, yxzheng@nju.edu.cn; Liming Ding, ding@nanoctr.cn

DOI: 10.1088/1674-4926/43/11/110202

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Thermally activated delayed fluorescence (TADF) emitter is a promising organic light-emitting diode (OLED) material due to low cost, wide luminous color gamut and 100% exciton utilization efficiency[1]. To achieve high TADF performance, a feasible strategy is to construct a twisted donor–acceptor (D–A) unit, decreasing the overlap between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO), and minimizing the energy gap (∆EST) between the lowest singlet (S1) and triplet (T1) states[2, 3]. However, this long-range charge transfer feature is often disadvantageous for achieving high oscillator strengths (f) and radiative transition rates (kr)[4] (Fig. 1(a)). Moreover, common TADF emitters always display broad electroluminescence spectra, whose full-widths at half-maximum (FWHMs) are 70–100 nm[5]. Therefore, it is necessary to realize a narrow-band emission system, which can improve the display quality greatly, with high kr and high rate constant of reverse intersystem crossing (kRISC).

Fig. 1.  (Color online) (a) Traditional design strategy for TADF. Reproduced with permission[6], Copyright 2016, Wiley-VCH. (b) Design strategy for MR-TADF. Reproduced with permission[6], Copyright 2016, Wiley-VCH. (c) New MR-TADF skeletons with fused aza-aromatics. Reproduced with permission[11], Copyright 2020, Wiley-VCH.

In 2015, Hetakeyma et al. developed a rigid polycyclic aromatic framework based on B/N system with opposite multiple-resonance (MR) effect for the first time, offering narrowband emission and efficient TADF performance[6] (Fig. 1(b)). In the emitter DABNA-1 with a highly rigid framework, the cofacial backbone resulted in short-range charge transfer, giving a high PLQY of 88% and a small FWHM of 30 nm in doped film. The corresponding OLEDs with 1 wt% doping offered a maximum external quantum efficiency (EQEmax) of 13.5% and a FWHM of 28 nm. Through modifying peripheral benzene ring and diphenylamine, the emission peak of DABNA-2 was slightly red-shifted and the OLEDs exhibited a FWHM of 28 nm and an EQEmax of 20.2%. In terms of device efficiency and color purity, it is superior to previous commercial blue emitters[7], and it also has potential to replace current commercial blue fluorescent materials as the core of OLEDs. Although MR-TADF emitters have achieved nearly full-color emission, this class of materials tends to exhibit poor kRISC values (~104 s–1) and severe efficiency roll-off at high current densities[8].

The strategies for alleviating the efficiency roll-off in MR-TADF OLEDs are as follows: (1) hyperfluorescence sensitization (HFS) by using TADF materials with high kRISC; (2) introducing "heavy atoms" like S or Se into the skeleton; (3) extending charge delocalization by fusing rigid skeleton. In 2019, Adachi et al. designed HFS OLEDs based on ν-DABNA[9] and hetero-donor-type TADF material (HDT-1) with accelerated S1 energy transfer process[10]. A high kRISC (9.2 × 105 s–1) was obtained in doped ternary film. Compared with host-guest type devices, sensitized pure-blue TADF OLEDs showed higher EQE and small efficiency roll-off, and the EQE reached 32% at 1000 cd/m2. Later, Duan et al. fused aza-aromatics into B/N skeleton and synthesized a pure-green AZA-BN emitter (λPL = 522 nm, FWHM = 28 nm)[11] (Fig. 1(c)). Benefitting from efficient HFS mechanism, HFS OLEDs displayed a higher EQEmax of 31.6% and smaller efficiency roll-off than non-sensitized devices[12]. Obviously, through the intervention of TADF sensitizer, the ternary emitting layer showed a more efficient triplet-exciton up-conversion rate.

According to Fermi’s golden rule, the kRISC in TADF systems mainly depends on spin-orbit coupling (SOC) and energy splitting between S1 and T1 states, as expressed in equation: kRISC |<S1|ĤSOC|T1>/ΔEST|2 [13] . Recently, Yasuda group developed a fused-nonacyclic π-system (BSBS-N1), embedded with B, N, and S atoms. With “heavy atom” S[14], BSBS-N1 exhibited a big <S1|ĤSOC|T1> value of 0.31 cm–1 and a high kRISC of 1.9 × 105 s–1. The corresponding OLEDs offered smaller efficiency roll-off than BBCz-SB LEDs[8]. Similarly, the strategy of using S to improve SOC was further confirmed by Yang et al.[15] kRISC over 105 s–1 was obtained in toluene solution and MR-TADF OLEDs showed smaller efficiency roll-off. To intuitively reflect the influence of heavy atom on RISC, Yasuda et al. doped Se atom into MR-TADF emitter (CzBSe)[16], yielding a record kRISC exceeding 108 s1 (Fig. 2(a)). Benefitting from its ultrafast triplet-exciton up-conversion, OLEDs with CzBSe offered an EQEmax of 23.9%, with narrow blue emission (λEL = 481 nm, FWHM = 33 nm) and significantly alleviated efficiency roll-off.

Fig. 2.  (Color online) (a) Molecular structures of CzBO, CzBS, and CzBSe with different chalcogens, conventional TADF mechanism and ideal superimposed fluorescence (SF) mechanism. Reproduced with permission[16], Copyright 2022, Wiley-VCH. (b) Double resonance unit superposition strategy. Reproduced with permission[18], Copyright 2022, Wiley-VCH.

Extending charge delocalization by fusing rigid skeleton is an effective approach to solve efficiency roll-off of MR-TADF OLEDs. By fusing hole-transport units (carbazole, dibenzofuran) into B/N framework, Zheng et al. achieved two π-extended MR-TADF emitters (NBO and NBNP), peaking at 487 and 500 nm with narrow FWHMs of 27 and 29 nm in toluene solutions[17], respectively. ∆EST were reduced (0.12 eV for NBO, 0.09 eV for NBNP) via charge delocalization of frontier orbitals. Meanwhile, SOC values were further improved due to the introduction of O and N heteroatoms. As results, kRISC for NBO and NBNP are nearly an order of magnitude higher than that of BBCz-SB. Consequently, NBO- and NBNP-based OLEDs showed EQEmax of 26.1% and 28.0%, with low efficiency roll-off. To further enhance the CT state of MR-TADF emitters, Zheng et al. adopted double resonance unit superposition strategy and obtained two green MR-TADF emitters (VTCzBN and TCz-VTCzBN) based on indolo[3,2,1-jk]carbazole (ICz) unit and B/N skeletons[18] (Fig. 2(b)), and the emissions peaked at 496 and 521 nm with FWHMs of 34 and 29 nm, respectively. Benefitting from thorough charge delocalization within frontier molecular orbitals, ∆EST values were close to 0 eV and large <S1|ĤSOC|T1> values were obtained. As a result, high kRISC values were also achieved, and VTCzBN and TCz-VTCzBN-based OLEDs showed EQEmax of 31.7% and 32.2%, with low efficiency roll-off, respectively. D-TCz-VTCzBN displayed ultra-pure green CIE of (0.22, 0.71), consistent with the green display standard of the National Television System Committee.

In short, enhancing kRISC of MR-TADF emitters is crucial for reducing efficiency roll-off of OLEDs. Some strategies are highlighted, like TADF sensitization, heavy atom introduction, extending charge delocalization. More efforts are needed to develop MR-TADF OLEDs with high EQE, low efficiency roll-off and narrow emission.

Acknowledgements: This work was supported by the National Natural Science Foundation of China (21975119). L. Ding thanks the open research fund of Songshan Lake Materials Laboratory (2021SLABFK02) and the National Natural Science Foundation of China (51922032 and 21961160720).


[1]
Uoyama H, Goushi K, Shizu K, et al. Highly efficient organic light-emitting diodes from delayed fluorescence. Nature, 2012, 492, 234 doi: 10.1038/nature11687
[2]
Yang Z, Mao Z, Xie Z, et al. Recent advances in organic thermally activated delayed fluorescence materials. Chem Soc Rev, 2017, 46, 915 doi: 10.1039/C6CS00368K
[3]
Ren B, Zuo C, Sun Y, et al. Intramolecular spatial charge transfer enhances TADF efficiency. J Semicond, 2021, 42, 050201 doi: 10.1088/1674-4926/42/5/050201
[4]
Notsuka N, Nakanotani H, Noda H, et al. Observation of nonradiative deactivation behavior from singlet and triplet states of thermally activated delayed fluorescence emitters in solution. J Phys Chem Lett, 2020, 11, 562 doi: 10.1021/acs.jpclett.9b03302
[5]
Kaji H, Suzuki H, Fukushima T, et al. Purely organic electroluminescent material realizing 100% conversion from electricity to light. Nat Commun, 2015, 6, 8476 doi: 10.1038/ncomms9476
[6]
Hatakeyama T, Shiren K, Nakajima K, et al. Ultrapure blue thermally activated delayed fluorescence molecules: efficient HOMO-LUMO separation by the multiple resonance effect. Adv Mater, 2016, 28, 2777 doi: 10.1002/adma.201505491
[7]
Jung H, Kang S, Lee H, et al. High efficiency and long lifetime of a fluorescent blue-light emitter made of a pyrene core and optimized side groups. ACS Appl Mater Interfaces, 2018, 10, 30022 doi: 10.1021/acsami.8b09013
[8]
Yang M, Park I S, Yasuda T. Full-color, narrowband, and high-efficiency electroluminescence from boron and carbazole embedded polycyclic heteroaromatics. J Am Chem Soc, 2020, 142, 19468 doi: 10.1021/jacs.0c10081
[9]
Kondo Y, Yoshiura K, Kitera S, et al. Narrowband deep-blue organic light-emitting diode featuring an organoboron-based emitter. Nat Photonics, 2019, 13, 678 doi: 10.1038/s41566-019-0476-5
[10]
Chan C Y, Tanaka M, Lee Y T, et al. Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission. Nat Photonics, 2021, 15, 203 doi: 10.1038/s41566-020-00745-z
[11]
Zhang Y, Zhang D, Wei J, et al. Achieving pure green electroluminescence with CIEy of 0.69 and EQE of 28.2% from an aza-fused multi-resonance emitter. Angew Chem Int Ed, 2020, 59, 17499 doi: 10.1002/anie.202008264
[12]
Huang T, Wang Q, Xiao S, et al. Simultaneously enhanced reverse intersystem crossing and radiative decay in thermally activated delayed fluorophors with multiple through-space charge transfers. Angew Chem Int Ed, 2021, 60, 23771 doi: 10.1002/anie.202109041
[13]
Kim J U, Park I S, Chan C Y, et al. Nanosecond-time-scale delayed fluorescence molecule for deep-blue OLEDs with small efficiency rolloff. Nat Commun, 2020, 11, 1765 doi: 10.1038/s41467-020-15558-5
[14]
Nagata M, Min H, Watanabe E, et al. Fused-nonacyclic multi-resonance delayed fluorescence emitter based on ladder-thiaborin exhibiting narrowband sky-blue emission with accelerated reverse intersystem crossing. Angew Chem Int Ed, 2021, 60, 20280 doi: 10.1002/anie.202108283
[15]
Liu F, Cheng Z, Jiang Y, et al. Highly efficient asymmetric multiple resonance thermally activated delayed fluorescence emitter with EQE of 32.8% and extremely low efficiency roll-off. Angew Chem Int Ed, 2022, 61, e202116927 doi: 10.1002/anie.202116927
[16]
Park I S, Min H, Yasuda T. Ultrafast triplet-singlet exciton interconversion in narrowband blue organoboron emitters doped with heavy chalcogens. Angew Chem Int Ed, 2022, 61, e202205684 doi: 10.1002/ange.202205684
[17]
Luo X F, Ni H X, Ma H L, et al. Fused π-extended multiple-resonance induced thermally activated delayed fluorescence materials for high-efficiency and narrowband OLEDs with low efficiency roll-off. Adv Opt Mater, 2022, 10, 2102513 doi: 10.1002/adom.202102513
[18]
Luo X F, Song S Q, Ni H X, et al. Multiple-resonance-induced thermally activated delayed fluorescence materials based on indolo[3,2,1-jk]carbazole with an efficient and narrowband pure-green electroluminescence. Angew Chem Int Ed, 2022, in press doi: 10.1002/anie.202209984
Fig. 1.  (Color online) (a) Traditional design strategy for TADF. Reproduced with permission[6], Copyright 2016, Wiley-VCH. (b) Design strategy for MR-TADF. Reproduced with permission[6], Copyright 2016, Wiley-VCH. (c) New MR-TADF skeletons with fused aza-aromatics. Reproduced with permission[11], Copyright 2020, Wiley-VCH.

Fig. 2.  (Color online) (a) Molecular structures of CzBO, CzBS, and CzBSe with different chalcogens, conventional TADF mechanism and ideal superimposed fluorescence (SF) mechanism. Reproduced with permission[16], Copyright 2022, Wiley-VCH. (b) Double resonance unit superposition strategy. Reproduced with permission[18], Copyright 2022, Wiley-VCH.

[1]
Uoyama H, Goushi K, Shizu K, et al. Highly efficient organic light-emitting diodes from delayed fluorescence. Nature, 2012, 492, 234 doi: 10.1038/nature11687
[2]
Yang Z, Mao Z, Xie Z, et al. Recent advances in organic thermally activated delayed fluorescence materials. Chem Soc Rev, 2017, 46, 915 doi: 10.1039/C6CS00368K
[3]
Ren B, Zuo C, Sun Y, et al. Intramolecular spatial charge transfer enhances TADF efficiency. J Semicond, 2021, 42, 050201 doi: 10.1088/1674-4926/42/5/050201
[4]
Notsuka N, Nakanotani H, Noda H, et al. Observation of nonradiative deactivation behavior from singlet and triplet states of thermally activated delayed fluorescence emitters in solution. J Phys Chem Lett, 2020, 11, 562 doi: 10.1021/acs.jpclett.9b03302
[5]
Kaji H, Suzuki H, Fukushima T, et al. Purely organic electroluminescent material realizing 100% conversion from electricity to light. Nat Commun, 2015, 6, 8476 doi: 10.1038/ncomms9476
[6]
Hatakeyama T, Shiren K, Nakajima K, et al. Ultrapure blue thermally activated delayed fluorescence molecules: efficient HOMO-LUMO separation by the multiple resonance effect. Adv Mater, 2016, 28, 2777 doi: 10.1002/adma.201505491
[7]
Jung H, Kang S, Lee H, et al. High efficiency and long lifetime of a fluorescent blue-light emitter made of a pyrene core and optimized side groups. ACS Appl Mater Interfaces, 2018, 10, 30022 doi: 10.1021/acsami.8b09013
[8]
Yang M, Park I S, Yasuda T. Full-color, narrowband, and high-efficiency electroluminescence from boron and carbazole embedded polycyclic heteroaromatics. J Am Chem Soc, 2020, 142, 19468 doi: 10.1021/jacs.0c10081
[9]
Kondo Y, Yoshiura K, Kitera S, et al. Narrowband deep-blue organic light-emitting diode featuring an organoboron-based emitter. Nat Photonics, 2019, 13, 678 doi: 10.1038/s41566-019-0476-5
[10]
Chan C Y, Tanaka M, Lee Y T, et al. Stable pure-blue hyperfluorescence organic light-emitting diodes with high-efficiency and narrow emission. Nat Photonics, 2021, 15, 203 doi: 10.1038/s41566-020-00745-z
[11]
Zhang Y, Zhang D, Wei J, et al. Achieving pure green electroluminescence with CIEy of 0.69 and EQE of 28.2% from an aza-fused multi-resonance emitter. Angew Chem Int Ed, 2020, 59, 17499 doi: 10.1002/anie.202008264
[12]
Huang T, Wang Q, Xiao S, et al. Simultaneously enhanced reverse intersystem crossing and radiative decay in thermally activated delayed fluorophors with multiple through-space charge transfers. Angew Chem Int Ed, 2021, 60, 23771 doi: 10.1002/anie.202109041
[13]
Kim J U, Park I S, Chan C Y, et al. Nanosecond-time-scale delayed fluorescence molecule for deep-blue OLEDs with small efficiency rolloff. Nat Commun, 2020, 11, 1765 doi: 10.1038/s41467-020-15558-5
[14]
Nagata M, Min H, Watanabe E, et al. Fused-nonacyclic multi-resonance delayed fluorescence emitter based on ladder-thiaborin exhibiting narrowband sky-blue emission with accelerated reverse intersystem crossing. Angew Chem Int Ed, 2021, 60, 20280 doi: 10.1002/anie.202108283
[15]
Liu F, Cheng Z, Jiang Y, et al. Highly efficient asymmetric multiple resonance thermally activated delayed fluorescence emitter with EQE of 32.8% and extremely low efficiency roll-off. Angew Chem Int Ed, 2022, 61, e202116927 doi: 10.1002/anie.202116927
[16]
Park I S, Min H, Yasuda T. Ultrafast triplet-singlet exciton interconversion in narrowband blue organoboron emitters doped with heavy chalcogens. Angew Chem Int Ed, 2022, 61, e202205684 doi: 10.1002/ange.202205684
[17]
Luo X F, Ni H X, Ma H L, et al. Fused π-extended multiple-resonance induced thermally activated delayed fluorescence materials for high-efficiency and narrowband OLEDs with low efficiency roll-off. Adv Opt Mater, 2022, 10, 2102513 doi: 10.1002/adom.202102513
[18]
Luo X F, Song S Q, Ni H X, et al. Multiple-resonance-induced thermally activated delayed fluorescence materials based on indolo[3,2,1-jk]carbazole with an efficient and narrowband pure-green electroluminescence. Angew Chem Int Ed, 2022, in press doi: 10.1002/anie.202209984
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1. Wu, X., Ni, S., Wang, C.-H. et al. Comprehensive Review on the Structural Diversity and Versatility of Multi-Resonance Fluorescence Emitters: Advance, Challenges, and Prospects toward OLEDs. Chemical Reviews, 2025. doi:10.1021/acs.chemrev.5c00021
2. Wan, D., Zhou, J., Meng, G. et al. Peripheral carbazole units-decorated MR emitter containing B−N covalent bond for highly efficient green OLEDs with low roll-off. Journal of Semiconductors, 2024, 45(8): 082402. doi:10.1088/1674-4926/24040008
3. Song, S.-Q., Yip, C.-F., Liu, Q.-M. et al. Efficient OLEDs with Alleviated Efficiency Roll-Off Based on MR-TADF Materials Containing Indolo[3, 2, 1-jk]carbazole. Advanced Optical Materials, 2024, 12(19): 2400200. doi:10.1002/adom.202400200
4. Luo, X.-F., Song, S.-Q., Wu, X. et al. A chiral spirofluorene-embedded multiple-resonance thermally activated delayed fluorescence emitter for efficient pure-green circularly polarized electroluminescence. Aggregate, 2024, 5(2): e445. doi:10.1002/agt2.445
5. Yan, L., Chen, B., Wang, D. et al. Efficient solution-processed narrowband green-emitting organic light emitting diodes sensitized by a thermally activated delayed fluorescence polymer. Journal of Materials Chemistry C, 2024. doi:10.1039/d4tc03115f
6. Sanyam, N., Khatua, R., Mondal, A. Cost-Effective Approach for Modeling of Multiresonant Thermally Activated Delayed Fluorescence Emitters. Journal of Chemical Theory and Computation, 2023, 19(24): 9290-9301. doi:10.1021/acs.jctc.3c01147
7. Luo, X.-F., Shen, L., Wang, J.-Y. et al. Double charge transfer processes enable a green multiple resonance-induced thermally activated delayed fluorescence emitter for an efficient narrowband OLED. Chemical Communications, 2023, 60(5): 574-577. doi:10.1039/d3cc05684h
8. Ni, H.-X., Sun, W., Luo, X.-F. et al. Peripherally non-planar multiple resonance induced thermally activated delayed fluorescence materials containing silyl units. Innovation Materials, 2023, 1(3): 100041. doi:10.59717/j.xinn-mater.2023.100041
9. Jiang, H., Jin, J., Wong, W.-Y. High-Performance Multi-Resonance Thermally Activated Delayed Fluorescence Emitters for Narrowband Organic Light-Emitting Diodes. Advanced Functional Materials, 2023, 33(50): 2306880. doi:10.1002/adfm.202306880
10. Luo, X.-F., Ni, H.-X., Liang, X. et al. Face-to-Face Steric Modulation to Achieve High Performance Multiple-Resonance Thermally Activated Delayed Fluorescence Emitters with Quenching Resistant Effect. Advanced Optical Materials, 2023, 11(8): 2203002. doi:10.1002/adom.202203002
11. Luo, X.-F., Ni, H.-X., Shen, L. et al. An indolo[3, 2, 1-jk]carbazole-fused multiple resonance-induced thermally activated delayed fluorescence emitter for an efficient narrowband OLED. Chemical Communications, 2023, 59(17): 2489-2492. doi:10.1039/d2cc06280a
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    Xufeng Luo, Lixiu Zhang, Youxuan Zheng, Liming Ding. Improving reverse intersystem crossing of MR-TADF emitters for OLEDs[J]. Journal of Semiconductors, 2022, 43(11): 110202. doi: 10.1088/1674-4926/43/11/110202
    X F Luo, L X Zhang, Y X Zheng, L M Ding. Improving reverse intersystem crossing of MR-TADF emitters for OLEDs[J]. J. Semicond, 2022, 43(11): 110202. doi: 10.1088/1674-4926/43/11/110202
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      Xufeng Luo, Lixiu Zhang, Youxuan Zheng, Liming Ding. Improving reverse intersystem crossing of MR-TADF emitters for OLEDs[J]. Journal of Semiconductors, 2022, 43(11): 110202. doi: 10.1088/1674-4926/43/11/110202 ****X F Luo, L X Zhang, Y X Zheng, L M Ding. Improving reverse intersystem crossing of MR-TADF emitters for OLEDs[J]. J. Semicond, 2022, 43(11): 110202. doi: 10.1088/1674-4926/43/11/110202
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      Xufeng Luo, Lixiu Zhang, Youxuan Zheng, Liming Ding. Improving reverse intersystem crossing of MR-TADF emitters for OLEDs[J]. Journal of Semiconductors, 2022, 43(11): 110202. doi: 10.1088/1674-4926/43/11/110202 ****
      X F Luo, L X Zhang, Y X Zheng, L M Ding. Improving reverse intersystem crossing of MR-TADF emitters for OLEDs[J]. J. Semicond, 2022, 43(11): 110202. doi: 10.1088/1674-4926/43/11/110202

      Improving reverse intersystem crossing of MR-TADF emitters for OLEDs

      DOI: 10.1088/1674-4926/43/11/110202
      More Information
      • Xufeng Luo:received his PhD in Nanjing University in 2022 under the supervision of Professor Youxuan Zheng. Now he is working in Ningbo University of Technology. His research focuses on optoelectronic materials
      • Lixiu Zhang:got her BS from Soochow University in 2019. Now she is a PhD student at University of Chinese Academy of Sciences under the supervision of Prof. Liming Ding. Her research focuses on optoelectronic devices
      • Youxuan Zheng:got his PhD in Chemistry from Changchun Institute of Applied Chemistry (CAS) under the supervision of Professor Hongjie Zhang. Then he worked in Institut für Angewandte Photophisik, Technische Universität Dresden (2002–2004), Consiglio Nazionale delle Ricerche (2005) and University of London (2006) as a postdoc. In 2006, he joined School of Chemistry and Chemical Engineering in Nanjing University. His research interests include lanthanide complexes, phosphorescent metal complexes, TADF materials, chiral materials and OLEDs
      • Liming Ding:got his PhD from University of Science and Technology of China (was a joint student at Changchun Institute of Applied Chemistry, CAS). He started his research on OSCs and PLEDs in Olle Inganäs Lab in 1998. Later on, he worked at National Center for Polymer Research, Wright-Patterson Air Force Base and Argonne National Lab (USA). He joined Konarka as a Senior Scientist in 2008. In 2010, he joined National Center for Nanoscience and Technology as a full professor. His research focuses on innovative materials and devices. He is RSC Fellow, and the Associate Editor for Journal of Semiconductors
      • Corresponding author: yxzheng@nju.edu.cnding@nanoctr.cn
      • Received Date: 2022-09-23
        Available Online: 2022-09-27

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