Size effect on efficiency droop of blue light emitting diode

Y. B. Tao; S. Y. Wang; Z. Z. Chen; Z. Gong; E. Y. Xie; Y. J. Chen; Y. F. Zhang; J. Mckendry; D. Massoubre; E. D. Gu; B. R. Rae; R. K. Henderson; G. Y. Zhang

doi:10.1002/pssc.201100483

Size effect on efficiency droop of blue light emitting diode

Y. B. Tao, S. Y. Wang^*, Z. Z. Chen, Z. Gong, E. Y. Xie, Y. J. Chen, Y. F. Zhang, J. Mckendry, D. Massoubre, E. D. Gu, B. R. Rae, R. K. Henderson, G. Y. Zhang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

In this paper, the size effects on the efficiency droop (ED) in blue InGaN/GaN quantum well light emitting diode are investigated. The smaller size LEDs can work well under much higher power density, especially when the size is reduced to under 40 micro-meters. It shows a weaker ED in these small LEDs. Time correlated single photon counting (TCSPC) measurements show a longer electroluminescence lifetime for smaller size LEDs, which implicates the nonradiative recombination is reduced. It is likely due to Aguer recombination reduction by quantum well (QW) band flatened with the device size decreasing. Cathodoluminescence results indicates that the strain in QWs is relaxed both in the whole pillar and along radial direction of the pillar. The better performance of the smaller size LED is likely attributed to strain relaxation.

Original language	English
Pages (from-to)	616-619
Number of pages	4
Journal	Physica Status Solidi (C) Current Topics in Solid State Physics
Volume	9
Issue number	3-4
DOIs	https://doi.org/10.1002/pssc.201100483
Publication status	Published - 1 Mar 2012

Keywords / Materials (for Non-textual outputs)

Efficiency droop
GaN
LED
Size effect

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10.1002/pssc.201100483

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@article{1202f419ff794ffbb5add5338c80dda7,

title = "Size effect on efficiency droop of blue light emitting diode",

abstract = "In this paper, the size effects on the efficiency droop (ED) in blue InGaN/GaN quantum well light emitting diode are investigated. The smaller size LEDs can work well under much higher power density, especially when the size is reduced to under 40 micro-meters. It shows a weaker ED in these small LEDs. Time correlated single photon counting (TCSPC) measurements show a longer electroluminescence lifetime for smaller size LEDs, which implicates the nonradiative recombination is reduced. It is likely due to Aguer recombination reduction by quantum well (QW) band flatened with the device size decreasing. Cathodoluminescence results indicates that the strain in QWs is relaxed both in the whole pillar and along radial direction of the pillar. The better performance of the smaller size LED is likely attributed to strain relaxation.",

keywords = "Efficiency droop, GaN, LED, Size effect",

author = "Tao, {Y. B.} and Wang, {S. Y.} and Chen, {Z. Z.} and Z. Gong and Xie, {E. Y.} and Chen, {Y. J.} and Zhang, {Y. F.} and J. Mckendry and D. Massoubre and Gu, {E. D.} and Rae, {B. R.} and Henderson, {R. K.} and Zhang, {G. Y.}",

year = "2012",

month = mar,

day = "1",

doi = "10.1002/pssc.201100483",

language = "English",

volume = "9",

pages = "616--619",

journal = "Physica Status Solidi (C) Current Topics in Solid State Physics",

issn = "1862-6351",

publisher = "Wiley-VCH",

number = "3-4",

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TY - JOUR

T1 - Size effect on efficiency droop of blue light emitting diode

AU - Tao, Y. B.

AU - Wang, S. Y.

AU - Chen, Z. Z.

AU - Gong, Z.

AU - Xie, E. Y.

AU - Chen, Y. J.

AU - Zhang, Y. F.

AU - Mckendry, J.

AU - Massoubre, D.

AU - Gu, E. D.

AU - Rae, B. R.

AU - Henderson, R. K.

AU - Zhang, G. Y.

PY - 2012/3/1

Y1 - 2012/3/1

N2 - In this paper, the size effects on the efficiency droop (ED) in blue InGaN/GaN quantum well light emitting diode are investigated. The smaller size LEDs can work well under much higher power density, especially when the size is reduced to under 40 micro-meters. It shows a weaker ED in these small LEDs. Time correlated single photon counting (TCSPC) measurements show a longer electroluminescence lifetime for smaller size LEDs, which implicates the nonradiative recombination is reduced. It is likely due to Aguer recombination reduction by quantum well (QW) band flatened with the device size decreasing. Cathodoluminescence results indicates that the strain in QWs is relaxed both in the whole pillar and along radial direction of the pillar. The better performance of the smaller size LED is likely attributed to strain relaxation.

AB - In this paper, the size effects on the efficiency droop (ED) in blue InGaN/GaN quantum well light emitting diode are investigated. The smaller size LEDs can work well under much higher power density, especially when the size is reduced to under 40 micro-meters. It shows a weaker ED in these small LEDs. Time correlated single photon counting (TCSPC) measurements show a longer electroluminescence lifetime for smaller size LEDs, which implicates the nonradiative recombination is reduced. It is likely due to Aguer recombination reduction by quantum well (QW) band flatened with the device size decreasing. Cathodoluminescence results indicates that the strain in QWs is relaxed both in the whole pillar and along radial direction of the pillar. The better performance of the smaller size LED is likely attributed to strain relaxation.

KW - Efficiency droop

KW - GaN

KW - LED

KW - Size effect

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U2 - 10.1002/pssc.201100483

DO - 10.1002/pssc.201100483

M3 - Article

AN - SCOPUS:84863378186

SN - 1862-6351

VL - 9

SP - 616

EP - 619

JO - Physica Status Solidi (C) Current Topics in Solid State Physics

JF - Physica Status Solidi (C) Current Topics in Solid State Physics

IS - 3-4

ER -

Size effect on efficiency droop of blue light emitting diode

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Keywords / Materials (for Non-textual outputs)

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