Study of dual-blue light-emitting diodes with asymmetric AlGaN graded barriers

Abstract

A dual-blue light-emitting diode (LED) with asymmetric AlGaN composition-graded barriers but without an AlGaN electron blocking layer (EBL) is analyzed numerically. Its spectral stability and efficiency droop are improved compared with those of the conventional InGaN/GaN quantum well (QW) dual-blue LEDs based on stacking structure of two In_0.18Ga_0.82N/GaN QWs and two In_0.12Ga_0.88N/GaN QWs on the same sapphire substrate. The improvement can be attributed to the markedly enhanced injection of holes into the dual-blue active regions and effective reduction of leakage current.

Keywords

Quantum Well / Apply Physic Letter / White Lead / Quantum Well Structure / Spectral Stability

References

[1] SchubertE F, KimJ K. Science, 2005, 308: 1274

[2] PimputkarS, SpeckJ S, DenbaarsS P, NakamuraS. Nature Photonics, 2009, 3: 180

[3] ZukauskasA, VaicekauskasR, IvanauskasF, GaskaR, ShurM S. Applied Physics Letters, 2002, 80: 234

[4] KimM H, SchubertM F, DaiQ, KimJ K, SchubertE F, PiprekJ, ParkY. Applied Physics Letters, 2007, 91: 183507-1

[5] KuoY K, YenS H, TsaiM C, LiouB T. Proc. of SPIE, 2007, 6669: 66691I-1

[6] LeeW, KimM H, ZhuD, NoemaunA N, KimJ K, SchubertE F. Journal of Applied Physics, 2010, 107: 063102-1

[7] ArifR A, EeY K, TansuN. Applied Physics Letters, 2007, 91: 091110-1

[8] ParkJ, KawakamiY. Applied Physics Letters, 2006, 88: 202107-1

[9] ParkS H, ParkJ, YoonE. Applied Physics Letters, 2007, 90: 023508-1

[10] ArifR A, ZhaoH, TansuN. Applied Physics Letters, 2008, 92: 011104-1

[11] ZhaoH, LiuG, TansuN. Applied Physics Letters, 2010, 97: 131114-1

[12] ChangS J, KuoC H, SuY K, WuL W, SheuJ K, WenT C, LaiW C, ChenJ R, TsaiJ M. IEEE Journal of Selected Topics in Quantum Electron, 2002, 8: 744

[13] ChangY A, ChangJ Y, KuoY T, KuoY K. Applied Physics Letters, 2012, 100: 251102-1

[14] YanQ R, ZhangY, LiS T, YanQ A, ShiP P, NiuQ L, HeM, LiG P, LiJ R. Optics Letters, 2012, 37: 1556

[15] ChenX W, ZhangY, LiS T, YanQ R, ZhengS W, HeM, FanG H. Physica Status Solidi A, 2011, 208: 1972

[16] APSYS by Crosslight Software Inc. Burnaby Canada, http://www.crosslight.com.

[17] KuoY K, ChangJ Y, TsaiM C, YenS H. Applied Physics Letters, 2009, 95: 011116-1

[18] VurgaftmanI, MeyerJ R. Journal of Applied Physics, 2003, 94: 3675

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