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The design and the preparation of GaN-based high-voltage DC light emitting diode are realized. It is found that the device, whose chip structure is truncated pyramid using the epitaxial wafer whose subsrate is a patterned sapphire substrate, has a higher luminous efficiency than other chip structures. The luminous efficiency increases up to 116.06 lm/W when the device is packaged into white LED at a color temperature of 4500 K which is driven by 20 mA, and the corresponding voltage is 50 V. The I-V curve shows that the threshold voltage is 36 V, corresponding to a drive current of 1.5 mA. The optical power increases approximately linearly with the increase of driving current when the driving current increases from 15 mA to 50 mA, and the luminous efficiency in this range decreases more slowly with the increase of driving current, indicating that the GaN-based high-voltage DC LED is favourably driven by large current density, and severe efficiency droop will not appear as the drive current density increases, which offers a new idea for studying and solving the efficiency droop problem from the chip level.
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Keywords:
- GaN-based high-voltage DC light emitting diode /
- pattern sapphire substrate /
- truncated pyramid chip structure /
- luminous efficiency
[1] Liu N X, Wang H B, Liu J P, Niu N H, Han J, Shen G D 2006 Acta Phys. Sin. 55 1424 (in Chinese) [刘乃鑫, 王怀兵, 刘建平, 牛南辉, 韩军, 沈光地 2006 55 1424]
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[3] Xu B, Yu Q X, Wu Q H, Liao Y, Wang G Z, Fang R C 2004 Acta Phys. Sin. 53 204 (in Chinese) [徐波, 余庆选, 吴气虹, 廖源, 王冠中, 方容川 2004 53 204]
[4] Windisch R, Heremans P, Knobloch A, Kiesel P, Döhler G H, Dutta B, Borgh G 1999 Appl. Phys. Lett. 74 2256
[5] Dong Y J, Zhang J B, Chen H T, Zeng X H 2011 Acta Phys. Sin. 60 0778 (in Chinese) [董雅娟, 张俊兵, 陈海涛, 曾祥华 2011 60 0778]
[6] Krames M R, Ochiai-Holcomb M, Höfler G E, Carter-Coman C, Chen E I, Tao I H, Gillot P, Cardner N F, Chui H C, Huang J W, Stockman S A, Kish F A, Craford M G, Tan T S, Kaiot C P, Hueschen M, Posselt J, Loh B, Sasser G, Collins D 1999 Appl. Phys. Lett. 75 2365
[7] Shmatov O, Li Z S 2003 IEE Proc.-Optoelectron. 150 273
[8] Kato Y, Kitamura S, Hiramatsu K, Sawaki N 1994 J. Cryst. Growth 144 133
[9] Jiang Y, Luo Y, Wang L, Li H T, Xi G Y, Zhao W, Han Y J 2009 Acta Phys. Sin. 58 3468 (in Chinese) [江洋, 罗毅, 汪莱, 李洪涛, 席光义, 赵维, 韩彦军 2009 58 3468]
[10] Jin Y Z, Hu Y P, Zeng X H, Yang Y J 2010 Acta Phys. Sin. 59 1258 (in Chinese) [金豫浙, 胡益培, 曾祥华, 杨益军2010 59 1258]
[11] Wang L J, Zhang S M, Zhu J H, Zhu J J, Zhao D G, Liu Z S, Jiang D S, Wang Y T, Yang H 2010 Chin. Phys. B 19 017307
[12] Kim M H, Schubert M F, Dai Q, Kim J K, Schubert E F, Piprek J, Park Y 2007 Appl. Phys. Lett. 91 183507
[13] Wang C H, Lin D W, Lee C Y, Tsai M A, Chen G L, Kuo H T, Hsu W H, Kuo H C, Lu T C, Wang S C, Chi G C 2011 IEEE Electron Device Letters 32 1098
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[1] Liu N X, Wang H B, Liu J P, Niu N H, Han J, Shen G D 2006 Acta Phys. Sin. 55 1424 (in Chinese) [刘乃鑫, 王怀兵, 刘建平, 牛南辉, 韩军, 沈光地 2006 55 1424]
[2] Nakamura S, Mukai T, Senoh M 1994 Appl. Phys. Lett. 64 1687
[3] Xu B, Yu Q X, Wu Q H, Liao Y, Wang G Z, Fang R C 2004 Acta Phys. Sin. 53 204 (in Chinese) [徐波, 余庆选, 吴气虹, 廖源, 王冠中, 方容川 2004 53 204]
[4] Windisch R, Heremans P, Knobloch A, Kiesel P, Döhler G H, Dutta B, Borgh G 1999 Appl. Phys. Lett. 74 2256
[5] Dong Y J, Zhang J B, Chen H T, Zeng X H 2011 Acta Phys. Sin. 60 0778 (in Chinese) [董雅娟, 张俊兵, 陈海涛, 曾祥华 2011 60 0778]
[6] Krames M R, Ochiai-Holcomb M, Höfler G E, Carter-Coman C, Chen E I, Tao I H, Gillot P, Cardner N F, Chui H C, Huang J W, Stockman S A, Kish F A, Craford M G, Tan T S, Kaiot C P, Hueschen M, Posselt J, Loh B, Sasser G, Collins D 1999 Appl. Phys. Lett. 75 2365
[7] Shmatov O, Li Z S 2003 IEE Proc.-Optoelectron. 150 273
[8] Kato Y, Kitamura S, Hiramatsu K, Sawaki N 1994 J. Cryst. Growth 144 133
[9] Jiang Y, Luo Y, Wang L, Li H T, Xi G Y, Zhao W, Han Y J 2009 Acta Phys. Sin. 58 3468 (in Chinese) [江洋, 罗毅, 汪莱, 李洪涛, 席光义, 赵维, 韩彦军 2009 58 3468]
[10] Jin Y Z, Hu Y P, Zeng X H, Yang Y J 2010 Acta Phys. Sin. 59 1258 (in Chinese) [金豫浙, 胡益培, 曾祥华, 杨益军2010 59 1258]
[11] Wang L J, Zhang S M, Zhu J H, Zhu J J, Zhao D G, Liu Z S, Jiang D S, Wang Y T, Yang H 2010 Chin. Phys. B 19 017307
[12] Kim M H, Schubert M F, Dai Q, Kim J K, Schubert E F, Piprek J, Park Y 2007 Appl. Phys. Lett. 91 183507
[13] Wang C H, Lin D W, Lee C Y, Tsai M A, Chen G L, Kuo H T, Hsu W H, Kuo H C, Lu T C, Wang S C, Chi G C 2011 IEEE Electron Device Letters 32 1098
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