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LED PERFORMANCE

LED PERFORMANCE. A>B 5.6% A>C 8.6% at 90A/cm 2. FIG. 3. Color online EQE vs current density of LEDs A, B, and C. LED PERFORMANCE. FIG. 4. Color online Calculated band diagrams of LEDs at 90 A/cm2 , a LED A, b LED B, and c LED C. Calculated carrier concentrations of

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LED PERFORMANCE

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  1. LED PERFORMANCE A>B 5.6% A>C 8.6% at 90A/cm2 FIG. 3. Color online EQE vs current density of LEDs A, B, and C.

  2. LED PERFORMANCE FIG. 4. Color online Calculated band diagrams of LEDs at 90 A/cm2, a LED A, b LED B, and c LED C. Calculated carrier concentrations of LEDs at 90 A/cm2, d LED A, e LED B, and f LED C.

  3. LED PERFORMANCE TABLE I. Estimated efficiencies of the well near p-GaN in LEDs A, B, and C at 90 A/cm2. A is the Shockley–Read–Hall recombination coefficient (5.4*107 / s), B is the bimolecular recombination coefficient (2.0*10−11 cm3 / s), C is the Auger recombination coefficient (2.0*10−30 cm6 /s), n is the electron concentration, and p is the hole concentration.

  4. LED PERFORMANCE Bnp Efficiency= An + Bnp + Cn2p 1 Efficiency = An Cn +1+ Bnp B A is the Shockley–Read–Hall recombination coefficient B is the bimolecular recombination coefficient C is the Auger recombination coefficient

  5. CONCLUSIONS • The suppression of efficiency droop in LEDs without an EBL at high current density is attributed to an increased hole injection efficiency.

  6. REFERENCES Sang-Heon Han, Dong-Yul Lee, Sang-Jun Lee, Chu-Young Cho, Min-Ki Kwon,S. P. Lee,1 D. Y. Noh, Dong-Joon Kim, Yong Chun Kim, and Seong-Ju Park, “1Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Republic of Korea” APPLIED PHYSICS LETTERS 94, 231123 2009

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