TY - JOUR
T1 - Efficient electrophosphorescence using a doped ambipolar conductive molecular organic thin film
AU - Adachi, Chihaya
AU - Kwong, Raymond
AU - Forrest, Stephen R.
N1 - Funding Information:
The authors acknowledge C. Shen and Prof. A. Kahn for ultraviolet photoelectron spectroscopy measurements of the Ir(ppy) 3 HOMO energy. We also thank M.A. Baldo and Prof. M.E. Thompson for their insightful discussions. This work was funded by Universal Display Corporation, Defense Advanced Research Projects Agency, and Air Force Office of Scientific Research.
Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.
PY - 2001/3
Y1 - 2001/3
N2 - We demonstrate a high efficiency organic electrophosphorescent device comprised of a 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA) hole transport layer and a 4,4′-N,N′-dicarbazole-biphenyl (CBP) host doped with the metallorganic phosphor, fac-tris(2-phenylpyridine)iridium (Ir(ppy)3) as the green light-emitting layer. The device exhibits peak external quantum and power efficiencies of (12.0 ± 0.6)% and (45 ± 2) lm/W, respectively, corresponding to ∼60% internal quantum efficiency. A luminance of 1850 cd/m2 is observed at a current density of 10 mA/cm2. The device operating properties are controlled by electron injection into, and transport by the CBP layer along with hole injection from m-MTDATA directly into the Ir(ppy)3 highest occupied molecular level, leading to direct carrier recombination and exciton formation on the phosphor dopant. Ambipolar conduction properties of the Ir(ppy)3:CBP layer are established by analysis of triplet-triplet annihilation, exciton formation and the luminance-current-voltage characteristics.
AB - We demonstrate a high efficiency organic electrophosphorescent device comprised of a 4,4′,4″-tris(3-methylphenylphenylamino)triphenylamine (m-MTDATA) hole transport layer and a 4,4′-N,N′-dicarbazole-biphenyl (CBP) host doped with the metallorganic phosphor, fac-tris(2-phenylpyridine)iridium (Ir(ppy)3) as the green light-emitting layer. The device exhibits peak external quantum and power efficiencies of (12.0 ± 0.6)% and (45 ± 2) lm/W, respectively, corresponding to ∼60% internal quantum efficiency. A luminance of 1850 cd/m2 is observed at a current density of 10 mA/cm2. The device operating properties are controlled by electron injection into, and transport by the CBP layer along with hole injection from m-MTDATA directly into the Ir(ppy)3 highest occupied molecular level, leading to direct carrier recombination and exciton formation on the phosphor dopant. Ambipolar conduction properties of the Ir(ppy)3:CBP layer are established by analysis of triplet-triplet annihilation, exciton formation and the luminance-current-voltage characteristics.
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U2 - 10.1016/S1566-1199(01)00010-6
DO - 10.1016/S1566-1199(01)00010-6
M3 - Article
AN - SCOPUS:0002705372
SN - 1566-1199
VL - 2
SP - 37
EP - 43
JO - Organic Electronics
JF - Organic Electronics
IS - 1
ER -