High efficiency solution processed OLEDs using a thermally activated delayed fluorescence emitter

Ryutaro Komatsu, Hisahiro Sasabe, Susumu Inomata, Yong-Jin Pu, Junji Kido

doi:10.1016/j.synthmet.2015.02.009

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 2.7 eV, relatively high electron mobility of 10 −4 cm 2 V −1 s −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 (130 nm)/PEDOT:PSS (30 nm)/4CzIPN 5 wt% doped 4,4′- N , N ′-dicarbazolylbiphenyl (CBP) (35 nm)/bis-4,6-(3,5-di-4-pyridylphenyl)-2-methylpyrimidine (B4PyMPM) (65 nm)/8-quinolinolato lithium (Liq) (3 nm)/Al (100 nm)] were fabricated. This device showed a very low turn-on voltage of 2.5 V at 1 cd m −2 with a maximum power efficiency of over 55 lm W −1 . These performances are highest values reported in solution processed TADF OLEDs so far.

High efficiency solution processed OLEDs using a thermally activated delayed fluorescence emitter

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High efficiency solution processed OLEDs using a thermally activated delayed fluorescence emitter

書誌事項

この論文をさがす

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収録刊行物

被引用文献 (5)*注記

参考文献 (21)*注記

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