Journal
ADVANCED MATERIALS
Volume 32, Issue 29, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002120
Keywords
carrier balance; concentration quenching; deep-blue phosphorescence; N-heterocyclic carbene ligands; organic light-emitting diodes
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Funding
- National Research Foundation (NRF) by the Ministry of Science, ICT of Korea [NRF-2018R1A5A1025594, 2019M3D1A1078304]
- National Research Foundation of Korea [2019M3D1A1078304] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Deep-blue triplet emitters remain far inferior to standard red and green triplet emitters in terms of exhibiting high-color-purity Commission International de l'eclairage (CIE) y values of <= 0.1, external quantum efficiencies (EQEs), and high electroluminescent brightnesses in phosphorescent organic light-emitting diodes. In fact, no deep-blue triplet emitter with color purity and high device performance has previously been reported. In this study, a deep-blue triplet emitter, mer-tris(N-phenyl, N-benzyl-pyridoimidazol-2-yl)iridium(III) (mer-Ir1) is developed, which meets the requirements of the National Television System Committee (NTSC) CIE(x, y) coordinates of (0.149, 0.085) with an extremely high EQE of 24.8% and maximum brightness (L-max) of 6453 cd m(-2), by a device with a 40 vol% doping ratio. Moreover, another device demonstrates an EQE(max) of 21.3%, an L-max of 5247 cd m(-2), and CIE(x, y) coordinates of (0.151, 0.086) at a 30 vol% doping ratio. This is the first report of a high-performance, deep-blue phosphor, carbene-based Ir(III) complex device with outstanding CIE(x, y) color coordinates and a high EQE. The results of this study indicate that the novel dopant mer-Ir1 is a promising candidate for reducing power consumption in display applications.
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