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Achieving Optical Gain of the CsPbBr3 Perovskite Quantum Dots and Influence of the Variable Stripe Length Method
ACS Omega ( IF 3.7 ) Pub Date : 2021-02-17 , DOI: 10.1021/acsomega.0c05414 Saif M. H. Qaid 1, 2 , Hamid M. Ghaithan 1 , Bandar Ali Al-Asbahi 1, 3 , Abdullah S. Aldwayyan 1, 4, 5
ACS Omega ( IF 3.7 ) Pub Date : 2021-02-17 , DOI: 10.1021/acsomega.0c05414 Saif M. H. Qaid 1, 2 , Hamid M. Ghaithan 1 , Bandar Ali Al-Asbahi 1, 3 , Abdullah S. Aldwayyan 1, 4, 5
Affiliation
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High-quality inorganic cesium lead halide perovskite quantum dot (CsPbBr3 PQD) thin films were successfully deposited directly from a powdered source and used as an active laser medium following the examination of their distinctive surface and structural properties. To determine the suitability of the CsPbBr3 PQDs as an active laser medium, amplified spontaneous emission (ASE) and optical gain properties were investigated under picosecond pulse excitation using the variable stripe length (VSL) method. The thin film of CsPbBr3 PQDs has exhibited a sufficient value of the optical absorption coefficient of ∼0.86 × 105 cm–1 near the band edge and a direct band gap energy Eg ∼2.38 eV. The samples showed enhanced emission, and ASE was successfully recorded at a low threshold. The light emitted from the edge was observed near 2.40 and 2.33 eV for the stimulated emission (SE) and ASE regimes, respectively. The nonradiative decay contributes excitons dominant over biexcitons in the sample edge emission above the ASE threshold, making it practical for CsPbBr3 PQDs to be used as optical gain media without undergoing repeated SE processes above the threshold over long periods. A high value of the optical gain coefficient was recorded at 346 cm–1.
中文翻译：
CsPbBr 3钙钛矿量子点的光学增益及可变条纹长度方法的影响
通过检查其独特的表面和结构特性，成功地直接从粉末源中沉积了高质量的无机卤化铯铯钙钛矿量子点（CsPbBr 3 PQD）薄膜，并将其用作活性激光介质。为了确定CsPbBr 3 PQD作为有源激光介质的适用性，在皮秒脉冲激发下使用可变条带长度（VSL）方法研究了放大的自发发射（ASE）和光学增益特性。CsPbBr 3 PQDs薄膜在带边缘附近具有足够的光吸收系数〜0.86×10 5 cm –1，并且具有直接的带隙能量E g约2.38 eV。样品显示出增强的发射，并且在低阈值下成功记录了ASE。对于受激发射（SE）和ASE方案，分别在2.40 eV和2.33 eV附近观察到从边缘发出的光。非辐射衰减在高于ASE阈值的样品边缘发射中贡献了比双激子占优势的激子，这使得将CsPbBr 3 PQD用作光增益介质是可行的，而无需长时间在阈值之上进行重复SE处理。在346 cm –1处记录到很高的光学增益系数值。
更新日期：2021-03-02
中文翻译：
CsPbBr 3钙钛矿量子点的光学增益及可变条纹长度方法的影响
通过检查其独特的表面和结构特性，成功地直接从粉末源中沉积了高质量的无机卤化铯铯钙钛矿量子点（CsPbBr 3 PQD）薄膜，并将其用作活性激光介质。为了确定CsPbBr 3 PQD作为有源激光介质的适用性，在皮秒脉冲激发下使用可变条带长度（VSL）方法研究了放大的自发发射（ASE）和光学增益特性。CsPbBr 3 PQDs薄膜在带边缘附近具有足够的光吸收系数〜0.86×10 5 cm –1，并且具有直接的带隙能量E g约2.38 eV。样品显示出增强的发射，并且在低阈值下成功记录了ASE。对于受激发射（SE）和ASE方案，分别在2.40 eV和2.33 eV附近观察到从边缘发出的光。非辐射衰减在高于ASE阈值的样品边缘发射中贡献了比双激子占优势的激子，这使得将CsPbBr 3 PQD用作光增益介质是可行的，而无需长时间在阈值之上进行重复SE处理。在346 cm –1处记录到很高的光学增益系数值。
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