High-Efficiency Sky-Blue Organic Light-Emitting Diodes Utilizing Thermally-Activated Delayed Fluorescence

Yasuhide HIRAGA; Jun-ichi NISHIDE; Hajime NAKANOTANI; Masaki AONUMA; Chihaya ADACHI

doi:10.1587/transele.E98.C.971

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High-Efficiency Sky-Blue Organic Light-Emitting Diodes Utilizing Thermally-Activated Delayed Fluorescence

Yasuhide HIRAGA, Jun-ichi NISHIDE, Hajime NAKANOTANI, Masaki AONUMA, Chihaya ADACHI

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Keywords: organic light-emitting diodes (OLEDs), thermally activated delayed fluorescence (TADF), sky-blue OLEDs, white OLEDs (WOLEDs)

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2015 Volume E98.C Issue 10 Pages 971-976

DOI https://doi.org/10.1587/transele.E98.C.971

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Abstract

A highly efficient sky-blue organic light-emitting diode (OLED) based on a thermally-activated delayed fluorescence (TADF) molecule, 1,2-bis(carbazol-9-yl)-4,5-dicyanobenzene (2CzPN), was studied. The sky-blue OLED exhibited a maximum external electroluminescence quantum efficiency (η_EQE) of over 24.0%. In addition, a white OLED using 2CzPN combined with green and orange TADF emitters showed a high η_EQE of 17.3% with a maximum power efficiency of 52.3 lm/W and Commission Internationale de l'Eclairage coordinates of (0.32, 0.43).

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