Anomalous Temperature Dependence of Photoluminescence Caused by Non-Equilibrium Distributed Carriers in InGaN/(In)GaN Multiple Quantum Wells
| Autor: | Feng Liang, Ping Chen, Jing Yang, Xiaowei Wang, Zongshun Liu, Yuhao Ben, Degang Zhao |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Photoluminescence General Chemical Engineering 02 engineering and technology Electron 01 natural sciences Spectral line Article law.invention law 0103 physical sciences General Materials Science Spontaneous emission hydrogen treatment Quantum QD1-999 Quantum well 010302 applied physics Condensed matter physics anomalous temperature-dependent photoluminescence 021001 nanoscience & nanotechnology Chemistry 0210 nano-technology Luminescence non-equilibrium carriers dynamics InGaN/GaN MQWs Light-emitting diode |
| Zdroj: | Nanomaterials Nanomaterials, Vol 11, Iss 1023, p 1023 (2021) Volume 11 Issue 4 |
| ISSN: | 2079-4991 |
| Popis: | An increase of integrated photoluminescence (PL) intensity has been observed in a GaN-based multiple quantum wells (MQWs) sample. The integrated intensity of TDPL spectra forms an anomalous variation: it decreases from 30 to 100 K, then increases abnormally from 100 to 140 K and decreases again when temperature is beyond 140 K. The increased intensity is attributed to the electrons and holes whose distribution are spatial non-equilibrium distributed participated in the radiative recombination process and the quantum barrier layers are demonstrated to be the source of non-equilibrium distributed carriers. The temperature dependence of this kind of spatial non-equilibrium carriers’ dynamics is very different from that of equilibrium carriers, resulting in the increased emission efficiency which only occurs from 100 to 140 K. Moreover, the luminescence efficiency of MQWs with non-equilibrium carriers is much higher than that without non-equilibrium carriers, indicating the high luminescence efficiency of GaN-based LEDs may be caused by the non-equilibrium distributed carriers. Furthermore, a comparison analysis of MQWs sample with and without hydrogen treatment further demonstrates that the better quantum well is one of the key factors of this anomalous phenomenon. |
| Databáze: | OpenAIRE |
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