TY - JOUR
T1 - High-performance polymer light-emitting diodes doped with a red phosphorescent iridium complex
AU - Chen, Fang-Chung
AU - Yang, Yang
AU - Thompson, Mark E.
AU - Kido, Junji
PY - 2002/4/1
Y1 - 2002/4/1
N2 - High efficiency has been achieved in polymer light-emitting diodes (PLEDs) exhibiting red emission by doping a fluorescence host material, poly(vinylcarbazole) (PVK), with an iridium(III) complex, bis[2-(2 ′-benzothienyl)-pyridinato-N,C3′] iridium(acetylacetonate) (BtpIr). The electroluminescence spectrum has a maximum wavelength of 614 nm. The highest external quantum efficiency is 3.3%. Due to its short triplet excited lifetime (∼5 μs), the quenching of the triplet exciton in BtpIr-doped PVK PLEDs has been shown to be suppressed compared to platinum(II)-2,8,12,17-tetraethyl- 3,7,13,18-tetramethylporphyrin-doped PVK PLEDs. 65% of the peak efficiency can be sustained at high-current density and at the very high brightness of 1350 cd/m2. We suggest that both triplet-triplet annihilation and polaron-triplet annihilation involves exciton quenching.
AB - High efficiency has been achieved in polymer light-emitting diodes (PLEDs) exhibiting red emission by doping a fluorescence host material, poly(vinylcarbazole) (PVK), with an iridium(III) complex, bis[2-(2 ′-benzothienyl)-pyridinato-N,C3′] iridium(acetylacetonate) (BtpIr). The electroluminescence spectrum has a maximum wavelength of 614 nm. The highest external quantum efficiency is 3.3%. Due to its short triplet excited lifetime (∼5 μs), the quenching of the triplet exciton in BtpIr-doped PVK PLEDs has been shown to be suppressed compared to platinum(II)-2,8,12,17-tetraethyl- 3,7,13,18-tetramethylporphyrin-doped PVK PLEDs. 65% of the peak efficiency can be sustained at high-current density and at the very high brightness of 1350 cd/m2. We suggest that both triplet-triplet annihilation and polaron-triplet annihilation involves exciton quenching.
UR - http://www.scopus.com/inward/record.url?scp=79956011725&partnerID=8YFLogxK
U2 - 10.1063/1.1462862
DO - 10.1063/1.1462862
M3 - Article
AN - SCOPUS:79956011725
VL - 80
SP - 2308
EP - 2310
JO - Applied Physics Letters
JF - Applied Physics Letters
SN - 0003-6951
IS - 13
ER -