Issue 36, 2018

Deep-blue emitting poly[spiro(dibenzoazasiline-10′,9-silafluorene)] for power-efficient PLEDs

Abstract

Starting from poly(2,7-spirosilabifluorene) (PSSiBF), deep-blue emitting poly(5′-(5′′-hexylundecyl)-2,7-dibenzoazasiline-10′,9-silafluorene) (PSDBASiF) has been newly demonstrated for power-efficient PLEDs, where dibenzoazasiline instead of dibenzosilole is spiro-linked to the poly(dibenzosilole) backbone. Owing to the electron-donating nature of dibenzoazasiline, the HOMO and LUMO energy levels are found to be upshifted from −6.10/−2.40 eV of PSSiBF to −5.61/−2.16 eV of PSDBASiF. Simultaneously, hypsochromic absorption and emission maxima are observed for PSDBASiF, while its film photoluminescence quantum yield (PLQY) remains close to that of PSSiBF (0.84). PLEDs based on PSDBASiF realize a record-high power efficiency of 1.16 lm W−1 together with a peak EQE of 2.74% and CIE coordinates of (0.16, 0.06). Compared with PSSiBF (<0.2 lm W−1), an about 6-fold improvement is achieved for the power efficiency of PSDBASiF without sacrificing the EQE and color purity. The result clearly indicates that the incorporation of spiro-linked dibenzoazasiline into poly(dibenzosilole) is a promising strategy to develop power-efficient silicon-containing polymers with deep-blue emission.

Graphical abstract: Deep-blue emitting poly[spiro(dibenzoazasiline-10′,9-silafluorene)] for power-efficient PLEDs

Article information

Article type
Paper
Submitted
22 Jun 2018
Accepted
21 Jul 2018
First published
24 Jul 2018

J. Mater. Chem. C, 2018,6, 9599-9606

Deep-blue emitting poly[spiro(dibenzoazasiline-10′,9-silafluorene)] for power-efficient PLEDs

X. Xu, X. Li, S. Wang, J. Ding and L. Wang, J. Mater. Chem. C, 2018, 6, 9599 DOI: 10.1039/C8TC03074J

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