Journal
SCIENCE BULLETIN
Volume 66, Issue 20, Pages 2090-2098Publisher
ELSEVIER
DOI: 10.1016/j.scib.2021.06.018
Keywords
Anthracene derivative; Deep blue luminogen; Hot excitons; Triplet-triplet annihilation up-conversion; Non-doped device
Categories
Funding
- National Natural Science Foundation of China [62004074, 51727809]
- Science and Technology Department of Hubei Province [2019AAA063, 2020BAA016]
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This study reports the rational design and synthesis of two new deep blue luminogens, achieving high efficiency deep blue emissions in non-doped electroluminescent devices. The unprecedented electroluminescent efficiency is attributed to the combined effects of higher-order reversed intersystem crossing and triplet-triplet up-conversion. This research offers a new approach to resolve the shortage of high efficiency deep blue fluorescent emitters.
Achieving high-efficiency deep blue emitter with CIEy < 0.06 (CIE, Commission Internationale de L'Eclairage) and external quantum efficiency (EQE) >10% has been a long-standing challenge for traditional fluorescent materials in organic light-emitting diodes (OLEDs). Here, we report the rational design and synthesis of two new deep blue luminogens: 4-(10-(4'-(9H-carbazol-9-yl)-2,5-dimethyl-[1,1'-biphe nyl]-4-yl)anthracen-9-yl)benzonitrile (2M-ph-pCzAnBzt) and 4-(10-(4-(9H-carbazol-9-yl)-2,5-dimethyl phenyl)anthracen-9-yl)benzonitrile (2M-pCzAnBzt). In particular, 2M-ph-pCzAnBzt produces saturated deep blue emissions in a non-doped electroluminescent device with an exceptionally high EQE of 10.44% and CIEx,y (0.151, 0.057). The unprecedented electroluminescent efficiency is attributed to the combined effects of higher-order reversed intersystem crossing and triplet-triplet up-conversion, which are supported by analysis of theoretical calculation, triplet sensitization experiments, as well as nanosecond transient absorption spectroscopy. This research offers a new approach to resolve the shortage of high efficiency deep blue fluorescent emitters. (C) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
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