Issue 13, 2022

Spiro-configured dibenzosuberene compounds as deep-blue emitters for organic light-emitting diodes with a CIEy of 0.04

Abstract

Deep blue electroluminescence is highly required for organic light-emitting diode (OLED) technology. However, designing fluorophores displaying adequate CIE coordinates and particularly a low CIEy is far from an easy task. We report in this work the synthesis, the physico-chemical properties and the application of deep blue emitters constructed using the dibenzosuberene (DBS) molecular fragment in OLEDs. Three emitters, SPA-DBS, SIA-DBS and SQPTZ-DBS, have been constructed following a similar molecular design strategy that is the spiro connection of an electron rich unit, namely N-phenylacridine (PA), indoloacridine (IA) or quinolinophenothiazine (QPTZ) to the DBS core. The PA, IA and QPTZ fragments are known to be efficient hole injecters due to their strong electron-rich character. Through a structure/property relationship study, we analyse the electrochemical, photophysical and thermal behaviours of these three emitters. When used as an emitter in an OLED, a deep-blue emission with CIE of (0.16, 0.04) is obtained with SPA-DBS, reaching an EQE of ca. 1% and a Von of 4 V. The CIEy coordinate of 0.04 appears to be particularly low and fits the NSTC, ITU and EBU standards.

Graphical abstract: Spiro-configured dibenzosuberene compounds as deep-blue emitters for organic light-emitting diodes with a CIEy of 0.04

Supplementary files

Article information

Article type
Research Article
Submitted
31 Marts 2022
Accepted
13 Maijs 2022
First published
16 Maijs 2022
This article is Open Access
Creative Commons BY-NC license

Mater. Chem. Front., 2022,6, 1803-1813

Spiro-configured dibenzosuberene compounds as deep-blue emitters for organic light-emitting diodes with a CIEy of 0.04

C. Brouillac, W. Shen, J. Rault-Berthelot, O. Jeannin, C. Quinton, Z. Jiang and C. Poriel, Mater. Chem. Front., 2022, 6, 1803 DOI: 10.1039/D2QM00287F

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