磷光
发光
系统间交叉
分子间力
材料科学
超分子化学
Crystal(编程语言)
单重态
化学物理
持续发光
光化学
结晶学
晶体结构
光电子学
化学
分子
光学
荧光
热释光
原子物理学
激发态
物理
有机化学
程序设计语言
计算机科学
作者
Shyamal Biswas,Gouranga Manna,Bidisa Das,A.A. Bhattacharya,Arun K. Pal,Ayan Datta,Parvej Alam,Inamur Rahaman Laskar,Pramita Mondal,Mrinmay K. Mukhopadhyay,M. K. Sanyal,Somobrata Acharya
出处
期刊:Small
[Wiley]
日期:2021-10-07
卷期号:17 (51)
被引量:5
标识
DOI:10.1002/smll.202103212
摘要
Luminescence enhancement in 2D molecular crystals (2D crystals) is promising for a variety of optical applications, yet the availability is limited because of unclear mechanism and inefficient design strategy of luminescence control. Herein, the room temperature phosphorescence from micron long molecular thin free-standing 2D crystals of a mono-cyclometalated Ir(III) complex designed at the water surface is reported. A large luminescence enhancement is observed from the 2D crystals at 300 K, which is comparable with the rigidified solution at 77 K suggesting room temperature phosphorescence origin of the luminescence. In situ synchrotron grazing incidence X-ray diffraction measurements determine the constituent centered rectangular unit cells with precise molecular conformation that promotes the formation of 2D crystals. The molecular crystal design leads to a reduced singlet-triplet energy gap (ΔEST ) and mixing of singlet-triplet states by spin-orbit coupling (SOC) for efficient intersystem crossing, which explains the phosphorescence origin at room temperature and luminescence enhancement. The supramolecular assembly process provides an elegant design strategy to realize room temperature phosphorescence from 2D crystals by rigid intermolecular interactions.
科研通智能强力驱动
Strongly Powered by AbleSci AI