钙钛矿量子点薄膜中可饱和吸收的衬底和激发强度依赖性
Substrate and Excitation Intensity Dependence of Saturable Absorption in Perovskite Quantum Dot Films.
作者信息
Bhowmick Mithun, Ullrich Bruno, Murchland Madeline, Zhou Xuan, Ramkumar Chari
机构信息
Department of Mathematical and Physical Sciences, Miami University, 4200 N University Blvd., Middletown, OH 45042, USA.
Ullrich Photonics LLC, Manistique, MI 49854, USA.
出版信息
Nanomaterials (Basel). 2023 Feb 26;13(5):871. doi: 10.3390/nano13050871.
Saturable absorption in perovskite quantum dot (PQD) films, leading to saturation in photoluminescence (PL), is reported. PL of drop-casting films was used to probe how excitation intensity and host-substrate influence the growth of PL intensity. The PQD films were deposited on single-crystal GaAs, InP, Si wafers and glass. Saturable absorption was confirmed through PL saturation in all films, with different excitation intensity thresholds, suggesting strong substrate-dependent optical properties, resulting from absorption nonlinearities in the system. The observations extend our former studies (Appl. Phys. Lett., 2021, 119, 19, 192103), wherein we pointed out that the PL saturation in QDs can be used to create all-optical switches in combination with a bulk semiconductor host.
据报道，钙钛矿量子点（PQD）薄膜中存在可饱和吸收现象，这导致光致发光（PL）出现饱和。通过旋涂法制备的薄膜的光致发光被用于探究激发强度和主体 - 衬底如何影响光致发光强度的增长。PQD薄膜被沉积在单晶砷化镓、磷化铟、硅晶片和玻璃上。通过所有薄膜中的光致发光饱和现象证实了可饱和吸收，且具有不同的激发强度阈值，这表明系统中的吸收非线性导致了强烈的衬底依赖性光学性质。这些观察结果扩展了我们之前的研究（《应用物理快报》，2021年，第119卷，第19期，192103），在该研究中我们指出量子点中的光致发光饱和可与体半导体主体结合用于制造全光开关。
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