Cocrystallization Tailoring Multiple Radiative Decay Pathways for Amplified Spontaneous Emission

Geetha Bolla, Qing Liao, Saeed Amirjalayer, Zeyi Tu, Shaokai Lv, Jie Liu, Shuai Zhang, Yonggang Zhen, Yuanping Yi, Xinfeng Liu, Hongbing Fu, Harald Fuchs, Huanli Dong, Zhaohui Wang, Wenping Hu

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)281-289
Number of pages9
JournalAngewandte Chemie - International Edition
Volume60
Issue number1
DOIs
StatePublished - 4 Jan 2021
Externally publishedYes

Keywords

  • amplified spontaneous emission (ASE)
  • cocrystallization
  • halogen bonds
  • organic semiconductors
  • radiative decay pathways

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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