Size-dependent variation of efficiency in InGaN-based flip-chip near ultraviolet and blue micro light-emitting diodes

A. B. M. Hamidul Islam; Tae Kyoung Kim; Yu-Jung Cha; Jae Won Seo; Dong-Soo Shin; Jong-In Shim; Joon Seop Kwak

doi:10.1117/12.2625718

7 March 2022 Size-dependent variation of efficiency in InGaN-based flip-chip near ultraviolet and blue micro light-emitting diodes

A. B. M. Hamidul Islam, Tae Kyoung Kim, Yu-Jung Cha, Jae Won Seo, Dong-Soo Shin, Jong-In Shim, Joon Seop Kwak

Author Affiliations +

Proceedings Volume PC12022, Light-Emitting Devices, Materials, and Applications XXVI; PC1202217 (2022) https://doi.org/10.1117/12.2625718
Event: SPIE OPTO, 2022, San Francisco, California, United States

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Abstract

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, and 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

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