J. Semicond. > Volume 34 > Issue 5 > Article Number: 054010

Self-adaptive phosphor coating technology for wafer-level scale chip packaging

Linsong Zhou , , Haibo Rao , Wei Wang , Xianlong Wan , Junyuan Liao , Xuemei Wang , Da Zhou and Qiaolin Lei

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Abstract: A new self-adaptive phosphor coating technology has been successfully developed, which adopted a slurry method combined with a self-exposure process. A phosphor suspension in the water-soluble photoresist was applied and exposed to LED blue light itself and developed to form a conformal phosphor coating with self-adaptability to the angular distribution of intensity of blue light and better-performing spatial color uniformity. The self-adaptive phosphor coating technology had been successfully adopted in the wafer surface to realize a wafer-level scale phosphor conformal coating. The first-stage experiments show satisfying results and give an adequate demonstration of the flexibility of self-adaptive coating technology on application of WLSCP.

Key words: white light-emitting diodesself-adaptive conformal coatingwafer level encapsulation technologymulti-chip packaging

Abstract: A new self-adaptive phosphor coating technology has been successfully developed, which adopted a slurry method combined with a self-exposure process. A phosphor suspension in the water-soluble photoresist was applied and exposed to LED blue light itself and developed to form a conformal phosphor coating with self-adaptability to the angular distribution of intensity of blue light and better-performing spatial color uniformity. The self-adaptive phosphor coating technology had been successfully adopted in the wafer surface to realize a wafer-level scale phosphor conformal coating. The first-stage experiments show satisfying results and give an adequate demonstration of the flexibility of self-adaptive coating technology on application of WLSCP.

Key words: white light-emitting diodesself-adaptive conformal coatingwafer level encapsulation technologymulti-chip packaging



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[2]

Chen K, Zhang R, Lee S W R. Integration of phosphor printing and encapsulant dispensing processes for wafer level LED array packaging[J]. IEEE 11th International Conference on Electronic Packaging Technology & High Density Packaging, 2010: 1386.

[3]

Braune B, Petersen K, Strauss J. A new wafer level coating technique to reduce the color distribution of LEDs[J]. Proc SPIE, 2007, 6486: 64860X-1. doi: 10.1117/12.727556

[4]

Hou B, Rao H, Li J. Methods of increasing luminous deficiency of phosphor-converted LED realized by conformal phosphor coating[J]. IEEE Journal of Display Technology, 2009, 5(2): 57. doi: 10.1109/JDT.2008.2005272

[5]

Sommer C, Wenzl F P, Reil F. A comprehensive study on the parameters effecting color conversion in phosphor converted white light-emitting diodes[J]. Proc SPIE, 2010, 7784: 77840D-1. doi: 10.1117/12.878987

[6]

Hou B, Rao H, Li J. Phosphor coating technique with slurry method in application of white LED[J]. SPIE, 2007, 6841: 684106.

[7]

Rao H, Ding K, Song J. Self-adaptive phosphor coating technology for white LED packaging[J]. Frontiers of Optoelectron, 2012, 5(2): 147. doi: 10.1007/s12200-012-0236-3

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Zhu Y, Narendran N. Optimizing the performance of remote phosphor LEDs[J]. J Light & Vis Env, 2008, 32(2): 115.

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Narendran N, Gu Y, Freyssinier-Nova J P. Extracting phosphor-scattered photons to improve white LED efficiency[J]. Phys Status Solidi A, 2005, 202(6): R60. doi: 10.1002/pssa.v202:6

[10]

Fujita S, Yoshihara S, Sakamotoa A. YAG glass-ceramic phosphor for white LED (Ⅰ, Ⅱ)[J]. Proc SPIE, 2005, 5941: 594111. doi: 10.1117/12.614668

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L S Zhou, H B Rao, W Wang, X L Wan, J Y Liao, X M Wang, D Zhou, Q L Lei. Self-adaptive phosphor coating technology for wafer-level scale chip packaging[J]. J. Semicond., 2013, 34(5): 054010. doi: 10.1088/1674-4926/34/5/054010.

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Manuscript received: 27 November 2012 Manuscript revised: Online: Published: 01 May 2013

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