TY - GEN
T1 - High-efficiency and stable blue hyperfluorescence organic light-emitting diode
AU - Chan, Chin Yiu
AU - Lee, Yi Ting
AU - Tsuchiya, Yoichi
AU - Nakanotani, Hajime
AU - Adachi, Chihaya
N1 - Funding Information:
We sincerely acknowledge Prof. Takuji Hataketama for providing -DABNA financially supported by the JSPS Core-to-Core program and Kyulux Inc.
Publisher Copyright:
© 2022 SPIE.
PY - 2022
Y1 - 2022
N2 - Organic light-emitting diodes (OLEDs) are a promising light-emitting technology useful for various display applications1,2. Despite great progress in this field3-12, there is an ongoing challenge to realize high performance blue OLEDs with efficiency, good color purity, and device lifetime. Here, we report pure-blue (CIEx,y color coordinates of [0.13, 0.16]) OLEDs with high-efficiency (external quantum efficiency of 32 % at 1000 cd m-2), narrow-emission (full width half maximum of 19 nm), and good stability (LT95 of 18 hours at an initial luminance of 1000 cd m-2). The design is based on a two-unit stacked tandem hyperfluorescence (HF)-OLED with an improved singlet-excited energy transfer process from a sky-blue TADF assistant dopant (AD) (HDT-1) to a pure-blue terminal emitter (TE) (v-DABNA). Furthermore, the effect of dopant concentration of terminal emitter on the device performance of hyperfluorescence OLEDs is studied. Device shows a better color purity when dopant concentration is increased. On the other hand, new hyperfluorescence OLEDs have been fabricated, in which device stability has been extended with a new molecular design of TE.
AB - Organic light-emitting diodes (OLEDs) are a promising light-emitting technology useful for various display applications1,2. Despite great progress in this field3-12, there is an ongoing challenge to realize high performance blue OLEDs with efficiency, good color purity, and device lifetime. Here, we report pure-blue (CIEx,y color coordinates of [0.13, 0.16]) OLEDs with high-efficiency (external quantum efficiency of 32 % at 1000 cd m-2), narrow-emission (full width half maximum of 19 nm), and good stability (LT95 of 18 hours at an initial luminance of 1000 cd m-2). The design is based on a two-unit stacked tandem hyperfluorescence (HF)-OLED with an improved singlet-excited energy transfer process from a sky-blue TADF assistant dopant (AD) (HDT-1) to a pure-blue terminal emitter (TE) (v-DABNA). Furthermore, the effect of dopant concentration of terminal emitter on the device performance of hyperfluorescence OLEDs is studied. Device shows a better color purity when dopant concentration is increased. On the other hand, new hyperfluorescence OLEDs have been fabricated, in which device stability has been extended with a new molecular design of TE.
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U2 - 10.1117/12.2632333
DO - 10.1117/12.2632333
M3 - Conference contribution
AN - SCOPUS:85140979640
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Organic and Hybrid Light Emitting Materials and Devices XXVI
A2 - Adachi, Chihaya
A2 - Lee, Tae-Woo
A2 - So, Franky
PB - SPIE
T2 - Organic and Hybrid Light Emitting Materials and Devices XXVI 2022
Y2 - 21 August 2022 through 23 August 2022
ER -