Abstract
Highly efficient solution processed organic light-emitting devices (OLEDs) incorporating a thermally activated delayed fluorescent (TADF) emitter are developed. As a green emitter, we used 1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene (4CzIPN). As an electron transporting layer (ETL), we used phenylpyridine-based wide-energy gap materials. These ETLs have high triplet energy over 2.7eV, relatively high electron mobility of 10−4cm2V−1s−1, and high hole blocking ability to effectively confine all the excitons and carriers in the emissive layer. A solution processed OLED with a structure of [ITO (130nm)/PEDOT:PSS (30nm)/4CzIPN 5wt% doped 4,4′-N,N′-dicarbazolylbiphenyl (CBP) (35nm)/bis-4,6-(3,5-di-4-pyridylphenyl)-2-methylpyrimidine (B4PyMPM) (65nm)/8-quinolinolato lithium (Liq) (3nm)/Al (100nm)] were fabricated. This device showed a very low turn-on voltage of 2.5V at 1cdm−2 with a maximum power efficiency of over 55lmW−1. These performances are highest values reported in solution processed TADF OLEDs so far.
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