Bis‐Tridentate Ir(III) Metal Phosphors for Efficient Deep‐Blue Organic Light‐Emitting Diodes

Emissive Ir(III) metal complexes possessing two tridentate chelates (bis‐tridentate) are known to be more robust compared to those with three bidentate chelates (tris‐bidentate). Here, the deep‐blue‐emitting, bis‐tridentate Ir(III) metal phosphors bearing both the dicarbene pincer ancillary such as...

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Bibliographic Details
Published in:Advanced materials (Weinheim) 2017-09, Vol.29 (33), p.n/a
Main Authors: Kuo, Hsin‐Hung, Chen, Yi‐Ting, Devereux, Leon R., Wu, Chung‐Chih, Fox, Mark A., Kuei, Chu‐Yun, Chi, Yun, Lee, Gene‐Hsiang
Format: Article
Language:English
Subjects:
Benzene
Brightness
carbene
Chelates
Coordination compounds
Emissivity
Iridium
Light emitting diodes
Materials science
Organic light emitting diodes
phosphorescence
Phosphors
pyrazole
Quantum efficiency
tridentate
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Summary:Emissive Ir(III) metal complexes possessing two tridentate chelates (bis‐tridentate) are known to be more robust compared to those with three bidentate chelates (tris‐bidentate). Here, the deep‐blue‐emitting, bis‐tridentate Ir(III) metal phosphors bearing both the dicarbene pincer ancillary such as 2,6‐diimidazolylidene benzene and the 6‐pyrazolyl‐2‐phenoxylpyridine chromophoric chelate are synthesized. A deep‐blue organic light‐emitting diode from one phosphor exhibits Commission Internationale de l'Eclairage (CIE(x,y)) coordinates of (0.15, 0.17) with maximum external quantum efficiency (max. EQE) of 20.7% and EQE = 14.6% at the practical brightness of 100 cd m−2. A deep‐blue organic light‐emitting diode (OLED) from one bis‐tridentate Ir(III) phosphor 5 exhibits CIE(x,y) coordinates of (0.15, 0.17) with maximum external quantum efficiency (max. EQE) of 20.7% and EQE = 14.6% at the practical brightness of 100 cd m−2.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201702464