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Cocrystallization Tailoring Multiple Radiative Decay Pathways for Amplified Spontaneous Emission
Author(s) -
Bolla Geetha,
Liao Qing,
Amirjalayer Saeed,
Tu Zeyi,
Lv Shaokai,
Liu Jie,
Zhang Shuai,
Zhen Yonggang,
Yi Yuanping,
Liu Xinfeng,
Fu Hongbing,
Fuchs Harald,
Dong Huanli,
Wang Zhaohui,
Hu Wenping
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202007655
Subject(s) - photoluminescence , radiative transfer , lasing threshold , spontaneous emission , amplified spontaneous emission , quantum yield , chemical physics , halogen , chemistry , materials science , optoelectronics , atomic physics , laser , physics , optics , fluorescence , wavelength , alkyl , organic chemistry
Amplified spontaneous emission (ASE) is intrinsically associated with lasing applications. Inefficient photon energy transfer to ASE is a long‐standing issue for organic semiconductors that consist of multiple competing radiative decay pathways, far from being rationally regulated from the perspective of molecular arrangements. Herein, we achieve controllable molecular packing motifs by halogen‐bonded cocrystallization, leading to ten times increased radiative decay rate, four times larger ASE radiative decay selectivity and thus remarkable ASE threshold decrease from 223 to 22 μJ cm −2 , albeit with a low photoluminescence quantum yield. We have made an in‐depth investigation on the relationship among molecular arrangements, vibration modes, radiative decay profiles and ASE properties. The results suggest that cocrystallization presents a powerful approach to tailor the radiative decay pathways, which is fundamentally important to the development of organic ASE and lasing materials.