In:
Angewandte Chemie, Wiley, Vol. 126, No. 8 ( 2014-02-17), p. 2179-2183
Abstract:
To achieve high efficiencies in blue phosphorescent organic light‐emitting diodes (PhOLEDs), the triplet energies (T 1 ) of host materials are generally supposed to be higher than the blue phosphors. A small organic molecule with low singlet energy (S 1 ) of 2.80 eV and triplet energy of 2.71 eV can be used as the host material for the blue phosphor, [bis(4,6‐difluorophenylpyridinato‐ N , C 2′ )iridium(III)] tetrakis(1‐pyrazolyl)borate (FIr6; T 1 =2.73 eV). In both the photo‐ and electro‐excited processes, the energy transfer from the host material to FIr6 was found to be efficient. In a three organic‐layer device, the maximum current efficiency of 37 cd A −1 and power efficiency of 40 Lm W −1 were achieved for the FIr6‐based blue PhOLEDs.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.201308046
Language:
German
Publisher:
Wiley
Publication Date:
2014
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