材料科学
光化学
放大自发辐射
激光阈值
分子内力
光致发光
激发态
斯托克斯位移
芴
受激发射
发色团
光电子学
激光器
聚合物
发光
原子物理学
光学
化学
有机化学
物理
波长
复合材料
作者
Vijay P. Rahane,Atul Shukla,Ras Baizureen Roseli,Alexander R. Ireland,I. G. Gale,Elizabeth H. Krenske,Evan G. Moore,Ebinazar B. Namdas,Nidhi Jain,Shih‐Chun Lo
标识
DOI:10.1002/adom.202400840
摘要
Abstract Chromophores undergoing excited‐state intramolecular proton transfer (ESIPT) feature a distinct four‐level photocycle and significant Stokes shift, which make them ideal for achieving population inversion upon photoexcitation, a fundamental prerequisite for lasing, by mitigating the concerns of self‐absorption owing to spectral overlap. This study focuses on functionalizing the hydroxyphenyl‐benzothiazole ( HBT ) ESIPT laser dye through the introduction of fluorene and phenyl‐carbazole moieties at the para ‐position to the hydroxyl group, to demonstrate amplified spontaneous emission (ASE) activities. The synthesized HBT derivatives not only exhibit high thermal and photostability, but also high photoluminescence quantum yields, exceeding 40%, which is noteworthy for ESIPT materials emitting in the yellow–orange to red color ranges. Computational analyses show that these new HBT materials possess substantially lower ESIPT energy barriers, compared to their parent HBT, facilitating their efficient ESIPT processes. Moreover, these derivatives demonstrate a high radiative rate of 1.47 × 10 8 s −1 . Thin films of a fluorene‐substituted HBT ( HBT ‐ pFl ) show a low solid‐state amplified spontaneous emission threshold value of 3.8 µJ cm −2 at 582 nm, representing the lowest reported solid‐state ASE threshold for laser dyes in the orange emission region (575–600 nm) to date.
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