Open AccessWhite Emissions Containing Room Temperature Phosphorescence from Different Excited States of a D– π –A Molecule Depending on the Aggregate States
Author(s) -
Du Mingxu,
Shi Yuhao,
Zhou Qi,
Yin Zheng,
Chen Liangliang,
Shu Yilin,
Sun GuangYan,
Zhang Guanxin,
Peng Qian,
Zhang Deqing
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202104539
Subject(s) - excited state , phosphorescence , materials science , fluorescence , singlet state , triplet state , optoelectronics , photochemistry , atomic physics , chemistry , optics , physics
Development of pure organic molecular materials with room temperature phosphorescence (RTP) and their applications for white emitters have received significant attentions recently. Herein, a D– π –A molecule (DMACPPY) which can realize white emitting under ambient conditions both in the crystal state and the doped‐film state by combining RTP with two fluorescent emissions is reported. The white emission from the crystalline sample of DMACPPY consists fluorescence from S 2 (the second excited singlet state) and S 1 (the first excited singlet state) along with RTP from T 1 (the first excited triplet state), namely, SST‐type white light. While, the white emission from the poly methyl methacrylate (PMMA) film doped with DMACPPY contains fluorescences from S 2 and S 1 , and RTP from T 2 (the second excited triplet state) rather than T 1 (STS type). DMACPPY cannot exhibit white spectrum within alternative crystalline state since inferior RTP intensity despite similar ternary emissions. The results demonstrate that the emissive properties for excited states of DMACPPY can be tuned by changing the aggregate state from crystalline to dispersion state in PMMA film. This new RTP emitter fulfills the talent for white emitting and achieves dual‐mode white emissions, invisibly, expands the application range for pure organic and heavy atom‐free RTP materials.