| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Carrier Dynamics Determined by Carrier-Phonon Coupling in InGaN/GaN Multiple Quantum Well Blue Light Emitting Diodes |
| Sheng Cao, Xiao-Ming Wu**, Jun-Lin Liu, Feng-Yi Jiang |
National Institute of LED on Si Substrate, Nanchang University, Nanchang 330096
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| Cite this article: |
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Sheng Cao, Xiao-Ming Wu, Jun-Lin Liu et al 2019 Chin. Phys. Lett. 36 028501 |
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Abstract Phonon sidebands in the electrolumiescence (EL) spectra of InGaN/GaN multiple quantum well blue light emitting diodes are investigated. S-shaped injection current dependence of the energy spacing (ES) between the zero-phonon and first-order phonon-assisted luminescence lines is observed in a temperature range of 100–150 K. The S-shape is suppressed with increasing temperature from 100 to 150 K, and vanishes at temperature above 200 K. The S-shaped injection dependence of ES at low temperatures could be explained by the three stages of carrier dynamics related to localization states: (i) carrier relaxation from shallow into deep localization states, (ii) band filling of shallow and deep localization states, and (iii) carrier overflow from deep to shallow localization states and to higher energy states. The three stages show strong temperature dependence. It is proposed that the fast change of the carrier lifetime with temperature is responsible for the suppression of S-shaped feature. The proposed mechanisms reveal carrier recombination dynamics in the EL of InGaN/GaN MQWs at various injection current densities and temperatures.
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Received: 16 August 2018
Published: 22 January 2019
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| PACS: |
85.60.Dw
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(Photodiodes; phototransistors; photoresistors)
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78.60.Fi
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(Electroluminescence)
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78.67.De
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(Quantum wells)
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71.38.-k
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(Polarons and electron-phonon interactions)
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| Fund: Supported by the National Science Foundation for Young Scientists of China under Grant No 11604137, the Jiangxi Province Postdoctoral Science Foundation Funded Project under Grant No 2015KY32, and the State Key Program of Research and Development of China under Grant Nos 2016YFB040060 and 2016YFB0400601. |
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