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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the Physical Activity for Health Group based within the School of Psychological Sciences & Health. Research here seeks to better understand how and why physical activity improves health, gain a better understanding of the amount, intensity, and type of physical activity needed for health benefits, and evaluate the effect of interventions to promote physical activity.

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Capability of GaN based micro-light emitting diodes operated at an injection level of kA/cm2

Jiao, Q. Q. and Chen, Z. Z. and Ma, J. and Wang, S. Y. and Li, Y. and Jiang, S. and Feng, Y. L. and Li, J. Z. and Chen, Y. F. and Yu, T. J. and Wang, S. F. and Zhang, G. Y. and Tian, P. F. and Xie, E. Y. and Gong, Z. and Gu, E. D. and Dawson, M. D. (2015) Capability of GaN based micro-light emitting diodes operated at an injection level of kA/cm2. Optics Express, 23 (13). pp. 16565-16574. ISSN 1094-4087

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Jiao_etal_OE_2015_Capability_of_GaN_based_micro_light_emitting_diodes_operated_at_an_injection.pdf - Accepted Author Manuscript

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Different size InGaN/GaN based micro-LEDs (μLEDs) are fabricated. An extremely high injection level above 16 kA/cm2 is achieved for 10 μm-diameter LED. The lateral current density and carrier distributions of the μLEDs are simulated by APSYS software. Streak camera time resolved photoluminescence (TRPL) results show clear evidence that the band-gap renormalization (BGR) effect is weakened by strain relaxation in smaller size μLEDs. BGR affects the relaxation of free carriers on the conduction band bottom in multiple quantum wells (MQWs), and then indirectly affects the recombination rate of carriers. An energy band model based on BGR effect is made to explain the high-injection-level phenomenon for μLEDs.