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22.1: Invited Paper: Color Tuning Dopants for Electrophosphorescent Devices: Toward Efficient Blue Phosphorescence from Metal Complexes
Author(s) -
Thompson Mark E.,
Li Jian,
Tamayo Arnold,
Sajoto Tissa,
Djurovich Peter,
Forrest Stephen R.,
Holmes Russell J.,
Brown Julie,
Brooks Jason
Publication year - 2005
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.2036181
Subject(s) - phosphorescence , ligand (biochemistry) , imidazole , photochemistry , dopant , oled , deep blue , carbene , pyridine , materials science , metal , blue light , chemistry , fluorescence , optoelectronics , doping , nanotechnology , stereochemistry , organic chemistry , physics , optics , catalysis , biochemistry , receptor , layer (electronics)
In this paper, we describe different strategies for achieving efficient blue electrophosphorescence. The first approach involves the use of ancillary ligand tuning of emission. The emissive unit is an organometallic Ir fragment, whose triplet energy is tuned by the choice of ancillary ligand. This approach is useful for making blue emitters, but luminance efficiency drops when the energy is shifted to saturated blue. The second approach described here is to shift the cyclometallated ligand from phenyl‐pyridine to either a phenyl‐pyrrazole or phenyl‐imidazole. Both complexes emit strongly in the near UV, however, only the imidazole complex (carbene ligand) emits strongly at room temperature.