Jump to main content
Jump to site search

Issue 12, 2020

Pendant conjugated molecules based on a heterogeneous core structure with enhanced morphological and emissive properties for organic semiconductor lasing

Author affiliations

Abstract

A family of oligofluorene-type pendant conjugated molecules (C1 and C2), consisting of a triazine center with two diphenylamine and one carbazole heterogeneous substituents to form a donor–acceptor (D–A) core structure, are synthesized and characterized. The relationship between the molecular architectures and the corresponding functional properties was systematically investigated by varying the fluorene lengths and the substituents on the triazine center and by comparing with the linear oligomer counterparts (xFCz), the pendant model compound (DNPhCzT) and the analogue with a homogeneous pendant core structure (T-m). The resulting pendant conjugated molecules exhibited a depressed crystallization tendency and thus enhanced morphology stability due to the incorporation of a bulky heterogeneous pendant core structure. Remarkably, enhanced photoluminescence quantum yields (PLQYs) (0.76 for C1 and 0.61 for C2) were afforded by virtue of the integration of bulky diphenylamine-carbazole heterogeneous core structures, in comparison with their homogeneous pendant analogue T-m (0.58). Solution-processed neat films demonstrated promising amplified spontaneous emission (ASE). The lowest ASE threshold (EASEth) for the non-doped films was recorded as 5.0 μJ cm−2 and 6.4 μJ cm−2 for C1 and C2, respectively. The EASEth was almost unchanged for C1 upon annealing from room temperature to 150 °C, while the EASEth of the linear counterparts exhibited a sudden increase above 100 °C. Compared to C2 with extended oligofluorene arms, C1 with one fluorene arm exhibited a lower EASEth and better optical stability at high temperature. The results suggest that excellent optoelectronic properties and enhanced thermal and morphological stabilities are afforded by constructing pendant conjugated molecules with a bulky heterogeneous core structure, and these materials have great potential as gain media for organic lasing.

Graphical abstract: Pendant conjugated molecules based on a heterogeneous core structure with enhanced morphological and emissive properties for organic semiconductor lasing

Supplementary files

Article information


Submitted
21 Jun 2020
Accepted
28 Sep 2020
First published
29 Sep 2020

Mater. Chem. Front., 2020,4, 3660-3668
Article type
Research Article

Pendant conjugated molecules based on a heterogeneous core structure with enhanced morphological and emissive properties for organic semiconductor lasing

X. Liu, M. Sang, J. Zhou, S. Xu, J. Zhang, Y. Yan, H. Lin and W. Lai, Mater. Chem. Front., 2020, 4, 3660 DOI: 10.1039/D0QM00418A

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

Search articles by author

Spotlight

Advertisements