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城戸・笹部研究室

ラボニュース

2015年02月07日
リーディング2年生小松龍太郎君の論文が Synthetic Metals に掲載!

リーディング2年生小松龍太郎君の論文が Synthetic Metals に掲載されました。龍太郎おめでとう!

 

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

Ryutaro Komatsu, Hisahiro Sasabe*,  Susumu Inomataa, Yong-Jin Pu, and Junji Kido*

 

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 cm2 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.

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