Lee Junseo, Wang Li, Eguchi Daichi, Tamai Naoto
School of Science and Technology, Kwansei Gakuin University, 1 Gakuen Uegahara, Sanda, Hyogo 669-1330, Japan.
J Phys Chem Lett. 2025 Aug 21;16(33):8403-8409. doi: 10.1021/acs.jpclett.5c01695. Epub 2025 Aug 7.
Alloyed semiconductor nanoplatelets (NPLs) exhibit thickness- and composition-dependent luminescence bands with relatively narrow luminescence line widths, thus garnering significant attention for applications in LED and laser devices. Although understanding Auger recombination is crucial for these applications, the influence of the chemical composition of alloyed NPLs remains unclear. In this study, CdZnSe NPLs with various chemical compositions were synthesized, and their Auger recombination was investigated. An increase in Zn content within alloyed NPLs led to a shortening of the time constant of the biexciton Auger recombination. The final density of states, which is a critical factor in Auger recombination, was found to be larger in alloyed NPLs with an increased Zn content than in CdSe NPLs because of their heavier effective masses and band gap energy. These findings provide a deeper understanding of the fundamental physical properties of alloyed NPLs and pave the way for the advancement of applications utilizing these materials.
合金半导体纳米片（NPLs）呈现出与厚度和成分相关的发光带，且发光线宽相对较窄，因此在发光二极管（LED）和激光器件应用中备受关注。尽管理解俄歇复合对于这些应用至关重要，但合金化纳米片化学成分的影响仍不明确。在本研究中，合成了具有不同化学成分的CdZnSe纳米片，并对其俄歇复合进行了研究。合金化纳米片中锌含量的增加导致双激子俄歇复合的时间常数缩短。由于其有效质量和带隙能量更大，在锌含量增加的合金化纳米片中，作为俄歇复合关键因素的最终态密度比CdSe纳米片中更大。这些发现为深入理解合金化纳米片的基本物理性质提供了帮助，并为利用这些材料推进应用铺平了道路。
