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Issue 36, 2020
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Spiro-type host materials with rigidified skeletons for RGB phosphorescent OLEDs

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Abstract

A universal host material for red, green and blue phosphors raises challenges for the fabrication of efficient phosphorescent organic light-emitting diodes (PHOLEDs). Herein, two spiro host materials, namely 3-(4,6-diphenyl-1,3,5-triazin-2-yl)-9′,9′-dimethyl-9′H-spiro[fluorene-9,5′-quinolino[3,2,1-de]acridine] (QAF-TRZ) and 3′-(4,6-diphenyl-1,3,5-triazin-2-yl)-10-phenyl-10H-spiro[acridine-9,9′-fluorene] (STF-TRZ), are designed and synthesized. The designed strategy is more appropriate and rarely found among the reported spiro-based skeletons for organic light-emitting diodes (OLEDs). Both materials exhibited excellent electroluminescence performance. In particular, the RGB three-color PHOLEDs based on QAF-TRZ and STF-TRZ as hosts and FIrpic, Ir(ppy)2acac, and Ir(MDQ)2acac as emitters are fabricated. The blue PHOLEDs based on QAF-TRZ realize a maximum external quantum efficiency (EQE) of 19.4%, and remain 17.2% at 1000 cd m−2. On the other hand, green PHOLEDs show maximum EQEs of 21% and 19% for QAF-TRZ and STF-TRZ, respectively, and both devices exhibit low efficiency roll-off. The red devices obtain EQEs of 22.6% and 19.4% based on QAF-TRZ and STF-TRZ, respectively, in which the former has among the most efficient value. Consequently, these results confirm that host materials incorporating the spiro-motif with sufficiently high triplet energy are promising for obtaining high performance RGB-based PHOLEDs. The better device performance based on QAF-TRZ stems from its better hole transport capability, resulting in a superior charge recombination efficiency.

Graphical abstract: Spiro-type host materials with rigidified skeletons for RGB phosphorescent OLEDs

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Supplementary files

Article information


Submitted
18 Marts 2020
Accepted
01 Aug. 2020
First published
03 Aug. 2020

J. Mater. Chem. C, 2020,8, 12470-12477
Article type
Paper

Spiro-type host materials with rigidified skeletons for RGB phosphorescent OLEDs

A. Khan, X. Chen, S. Kumar, S. Yang, Y. Yu, W. Luo, Z. Jiang, M. Fung and L. Liao, J. Mater. Chem. C, 2020, 8, 12470
DOI: 10.1039/D0TC01389G

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