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The size-dependent variation of external-quantum-efficiency (EQE) has investigated by fabricating InGaN-based blue and near ultraviolet (NUV) micro light-emitting diodes (μ-LEDs) with mesa sizes from 10×10 μm2 to 250×250 μm2. We have compared the performances between blue and NUV μ-LEDs by measuring various optoelectronic characteristics, and found opposite trend between them. With reducing μ-LED sizes, the EQE of blue μ-LEDs decreases due to temperature-dependent efficiency droop which is consistently obtained by calculating the blueshift in peak-wavelengths and thermal-resistance. Contrary, the improved current spreading increases the light-extraction-efficiency which causes the EQE of small sized NUV μ-LEDs to increase.
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A. B. M. Hamidul Islam, Tae Kyoung Kim, Yu-Jung Cha, Jae Won Seo, Dong-Soo Shin, Jong-In Shim, Joon Seop Kwak, "Size-dependent variation of efficiency in InGaN-based flip-chip near ultraviolet and blue micro light-emitting diodes," Proc. SPIE PC12022, Light-Emitting Devices, Materials, and Applications XXVI, PC1202217 (7 March 2022); https://doi.org/10.1117/12.2625718