Halim Nur Diyana, Zaini Muhammad Safwan, Talib Zainal Abidin, Liew Josephine Ying Chyi, Kamarudin Mazliana Ahmad
Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang 43400, Selangor Darul Ehsan, Malaysia.
Department of Physics, College of Natural Sciences, Jeonbuk National University, 567, Baekje-daero, Deokjin-gu, Jeonju-si 54896, Jeollabuk-do, Korea.
Micromachines (Basel). 2022 Mar 15;13(3):443. doi: 10.3390/mi13030443.
The temperature dependence of photoluminescence (PL) emission is a valuable tool for investigating carrier localization, recombination, and carrier-phonon interactions. Herein, electron-phonon couplings in lead sulfide (PbS) quantum dots (QDs) and lead sulfide/manganese tellurite (PbS/MnTe) QDs is reported. The effect of temperature on the PL emission of PbS and PbS/MnTe was explored within a temperature range of 10 to 300 K. When temperature increased, PL emission was blue-shifted due to the confinement effect. The gradual broadening of the full width at half maximum (FWHM) with increasing temperature indicates electron-phonon interactions. An analysis based on the Boson model revealed that the values of the exciton acoustic phonon coupling coefficient, σ, and temperature-dependent linewidth, γ, for PbS/MnTe were larger than those for PbS, indicating stronger exciton longitudinal-optical-phonon coupling in the compound structure.
光致发光（PL）发射的温度依赖性是研究载流子局域化、复合以及载流子-声子相互作用的重要工具。本文报道了硫化铅（PbS）量子点（QDs）和硫化铅/碲酸锰（PbS/MnTe）量子点中的电子-声子耦合。在10至300 K的温度范围内研究了温度对PbS和PbS/MnTe的PL发射的影响。随着温度升高，由于限制效应PL发射发生蓝移。半高宽（FWHM）随温度升高逐渐变宽表明存在电子-声子相互作用。基于玻色子模型的分析表明，PbS/MnTe的激子声学声子耦合系数σ和温度依赖线宽γ的值大于PbS的，这表明复合结构中激子纵向光学声子耦合更强。
