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Synthesis and electroluminescence properties of tris-[5-choloro-8-hydroxyquinoline] aluminum Al(5-Clq)3

Rahul Kumar1, Parag Bhargava1, Ritu Srivastava2 and Priyanka Tyagi2

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 Corresponding author: Rahul Kumar, Email: kumarrahul003@gmail.com

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Abstract: A new electroluminescent material tris-[5-choloro-8-hydroxyquinoline] aluminum has been synthesized and characterized. Solution of this material Al(5-Clq)3 in toluene showed absorption maxima at 385 nm which was attributed to the moderate energy (π-π*) transitions of the aromatic rings. The photoluminescence spectrum of Al(5-Clq)3 in toluene solution showed a peak at 522 nm. This material shows thermal stability up to 400 ℃. The structure of the device is ITO/0.4 wt%F4-TCNQ doped α-NPD (35 nm) / Al(5-Clq)3(30 nm)/ BCP (6 nm)/ Alq3(30 nm)/ LiF (1 nm)/Al(150 nm). This device exhibited a luminescence peak at 585 nm (CIE coordinates, x= 0.39, y= 0.50). The maximum luminescence of the device was 920 Cd/m2 at 25 V. The maximum current efficiency of OLED was 0.27 Cd/A at 20 V and maximum power efficiency was 0.04 lm/W at 18 V.

Key words: organometallic compoundschemical synthesisvapour depositionphotoluminescence spectroscopyelectrical propertiesluminescence



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Fig. 1.  (a) Synthesis of tris-[5-choloro-8-hydroxyquinoline] aluminium (ø). (b) Device structure consisting of Al(5-Clq)$_{3}$ as emitter layer.

Fig. 2.  FTIR spectra of Al(5-Clq)$_{3}$. The inset figure shows thermo gravimetric analysis of Al(5-Clq)$_{3}$.

Fig. 3.  UV-visible and photoluminescence spectra of Al(5-Clq)$_{3}$.

Fig. 4.  (Color online) Electroluminescence spectrum of Al(5-Clq)$_{3}$ at different applied voltages.

Fig. 5.  $I$-$V$-$L$ characteristics of OLED device based on Al(5-Clq)$_{3}$ (inset graph shows current and power efficiency of OLED device).

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    Received: 12 November 2014 Revised: Online: Published: 01 June 2015

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      Rahul Kumar, Parag Bhargava, Ritu Srivastava, Priyanka Tyagi. Synthesis and electroluminescence properties of tris-[5-choloro-8-hydroxyquinoline] aluminum Al(5-Clq)3[J]. Journal of Semiconductors, 2015, 36(6): 064001. doi: 10.1088/1674-4926/36/6/064001 R Kumar, P Bhargava, R Srivastava, P Tyagi. Synthesis and electroluminescence properties of tris-[5-choloro-8-hydroxyquinoline] aluminum Al(5-Clq)3[J]. J. Semicond., 2015, 36(6): 064001. doi: 10.1088/1674-4926/36/6/064001.Export: BibTex EndNote
      Citation:
      Rahul Kumar, Parag Bhargava, Ritu Srivastava, Priyanka Tyagi. Synthesis and electroluminescence properties of tris-[5-choloro-8-hydroxyquinoline] aluminum Al(5-Clq)3[J]. Journal of Semiconductors, 2015, 36(6): 064001. doi: 10.1088/1674-4926/36/6/064001

      R Kumar, P Bhargava, R Srivastava, P Tyagi. Synthesis and electroluminescence properties of tris-[5-choloro-8-hydroxyquinoline] aluminum Al(5-Clq)3[J]. J. Semicond., 2015, 36(6): 064001. doi: 10.1088/1674-4926/36/6/064001.
      Export: BibTex EndNote

      Synthesis and electroluminescence properties of tris-[5-choloro-8-hydroxyquinoline] aluminum Al(5-Clq)3

      doi: 10.1088/1674-4926/36/6/064001
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      • Corresponding author: Email: kumarrahul003@gmail.com
      • Received Date: 2014-11-12
      • Published Date: 2015-01-25

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