• Optoelectronics Letters
  • Vol. 20, Issue 12, 736 (2024)
Jianyang DENG, Rui LI, Ya’nan GUO, Junxi WANG, Chengxin WANG, and Ziwu JI
DOI: 10.1007/s11801-024-3296-x Cite this Article
DENG Jianyang, LI Rui, GUO Ya’nan, WANG Junxi, WANG Chengxin, JI Ziwu. Deep localization features of photoluminescence in narrow AlGaN quantum wells[J]. Optoelectronics Letters, 2024, 20(12): 736 Copy Citation Text show less

Abstract

The research prepared two deep ultraviolet (DUV) AlGaN-based multiple quantum well (MQW) samples with the same Al content in the QWs but different well widths (3 nm for Sample A and 2 nm for Sample B). Photoluminescence (PL) measurements reveal that Sample A exhibits only one main PL peak across all measured temperatures, while Sample B displays one main PL peak at low temperatures and two distinct PL peaks at high temperatures. Furthermore, compared with Sample A, Sample B exhibits a more significant temperature-dependent PL peak wavelength blue shift relative to the Varshni curve, a more significant excitation power density-dependent PL peak blue shift accompanied by linewidth broadening, as well as a larger non-radiative recombination related activation energy and higher internal quantum efficiency (IQE). These findings can be explained by the observation that the narrower well width of Sample B induces a more pronounced effect of carrier localization than the wider well width of Sample A, due to the enhanced fluctuation in well width and reduced quantum-confined Stark effect (QCSE).
DENG Jianyang, LI Rui, GUO Ya’nan, WANG Junxi, WANG Chengxin, JI Ziwu. Deep localization features of photoluminescence in narrow AlGaN quantum wells[J]. Optoelectronics Letters, 2024, 20(12): 736
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