Issue 40, 2019

One-dimensional π–π stacking induces highly efficient pure organic room-temperature phosphorescence and ternary-emission single-molecule white light

Abstract

It is extremely challenging to achieve high-efficiency room-temperature phosphorescence (RTP) in pure organic metal-free systems. Herein, we systematically investigated the photophysical properties of thioxanthone (TX) and its halogenated derivatives (TX-R, R = F, Cl, Br, I), and 2-chlorothioxanthone (TX-Cl) exhibits very strong RTP with an absolute quantum yield (ΦRTP) of 74.7% as a crystal, which is outstanding in pure organic RTP materials. Experimental and theoretical investigations demonstrate that such a high-efficiency RTP of the TX-Cl crystal is attributed to the aggregate emission from one-dimensional strong π–π stacking, which significantly enhances both intersystem crossing (ISC, S1 → Tn) and phosphorescence radiative rate (T1 → S0). Moreover, a single-molecule white-light emitter (SMWLE) was harvested with the CIE coordinates of (0.31, 0.33) by precisely controlling the doping ratio of TX-Cl in a polymethyl methacrylate (PMMA) film, which consists of ternary emissions: monomer fluorescence, monomer RTP and aggregate RTP. This result provides an important prototype to explore high-efficiency RTP by supramolecular aggregation.

Graphical abstract: One-dimensional π–π stacking induces highly efficient pure organic room-temperature phosphorescence and ternary-emission single-molecule white light

Supplementary files

Article information

Article type
Paper
Submitted
19 ago 2019
Accepted
16 set 2019
First published
18 set 2019

J. Mater. Chem. C, 2019,7, 12502-12508

One-dimensional π–π stacking induces highly efficient pure organic room-temperature phosphorescence and ternary-emission single-molecule white light

Y. Wen, H. Liu, S. Zhang, Y. Gao, Y. Yan and B. Yang, J. Mater. Chem. C, 2019, 7, 12502 DOI: 10.1039/C9TC04580E

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements