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题目:
Near-Infrared Organic Single-Crystal Lasers with Polymorphism- Dependent Excited State Intramolecular Proton Transfer
 
 
作者:
Xuedong Wang,*, 1, 2 Zhi-Zhou Li,1 Shi-Feng Li, 3 Hui Li,2 Jianwei Chen, 2 Yishi Wu, 2 and Hongbing Fu*, 2, 4
 
 
单位:
1Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou, Jiangsu 215123, P. R. China
2Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry Chinese Academy of Sciences, Beijing 100190, P. R. China
3Changzhou Institute of Advanced Materials, Beijing University of Chemical Technology, Changzhou, Jiangsu 213164, P. R. China
4Beijing Key Laboratory for Optical Materials and Photonic Devices, Department of Chemistry, Capital Normal University, Beijing 100048, P. R. China"
 
 
摘要:
Organic solid-state lasers (OSSLs) are broadly tunable coherent sources, potentially compact, convenient, and manufactured at low costs. As compared with conventional organic materials, organic molecules with excited state intramolecular proton-transfer (ESIPT) process are excellent active laser medium candidates due to their inherent four-level system. This study demonstrates the effect of the polymorphism-dependent ESIPT on the OSSLs. It is found the α -phase crystals with a low photoluminescence quantum efficiency of ≈2% emit two components: the tautomer A emissions and the tautomer B emissions, which indicate the noncomplete ESIPT case. For comparison, the β -phase crystals with moderate intramolecular hydrogen-bonding emitting near-infrared photoluminescence have all tautomer B emissions, which are of relatively high photoluminescence quantum efficiency (≈15%) and are redshifted by an average of ≈250 nm from the corresponding absorptions. The complete ESIPT process of the β -phase crystals contributes to the amplified spontaneous near-infrared emission ( λ ≈ 730 nm) with a low threshold of ≈1.86 µJ cm−2. This work has provided the platform for the investigation of the ESIPT lasers, which contributes to the high-performance organic solidstate near-infrared laser devices.
 
 
影响因子:
5.359
 
 
分区情况:
一区
 
 
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