Phase Transition‐Induced Regulation of Room Temperature Phosphorescence and Delayed Fluorescence in Doping System
Abstract
Abstract Switching between triplet‐involved room temperature phosphorescence (RTP) and delayed fluorescence (DF) is pivotal for advancing molecular encryption application but remains a significant challenge in multicomponent material systems. In this study, we successfully realized the selective modulation of RTP and DF emissions in a donor‐acceptor doping system by inducing conformational changes in the donor through solid‐liquid transition. In the solid state, the donor adopts a highly twisted quasi‐axial conformation, which effectively suppresses non‐radiative decay, resulting in efficient green RTP. In contrast, in the liquid state, the donor transitions to a relatively planar conformation, forming the intermolecular charge transfer state with the acceptor, significantly reducing the energy gap between the lowest singlet and triplet excited states, thereby facilitating reverse intersystem crossing (RISC) and generating yellow DF. Furthermore, the coexistence of multiple emissive triplet states demonstrates promising applications in information encryption, ink‐free rewritable paper, and thermal sensing.
Article Details
Authors (14)
Chenxiao Li
State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM) School of Flexible Electronics (Future Technologies) Nanjing Tech University (NanjingTech) Nanjing 211816 China
Yuteng Feng
State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM) School of Flexible Electronics (Future Technologies) Nanjing Tech University (NanjingTech) Nanjing 211816 China
Yue Feng
Yuehui Lin
State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM) School of Flexible Electronics (Future Technologies) Nanjing Tech University (NanjingTech) Nanjing 211816 China
Na Wang
Kun Liu
Qiuzhuo Dong
State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies)
Chengguang Huang
State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM) School of Flexible Electronics (Future Technologies) Nanjing Tech University (NanjingTech) Nanjing 211816 China
Huifang Shi
Kang Shen
Wei Yao
State Key Laboratory of Membrane Biology and Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Institute of Molecular Medicine, College of Future Technology and Peking-Tsinghua Center for Life Sciences and International Data Group/McGovern Institute for Brain Research, Peking University
Huili Ma
State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies)
Zhongfu An
State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies)
Wei Huang