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19‐1: Invited Paper: Stable Pure‐Blue Hyperfluorescence OLEDs
Author(s) -
Chan Chin-Yiu,
Lee Yi-Ting,
Tanaka Masaki,
Wong Yiu-Wing,
Nakanotani Hajime,
Adachi Chihaya
Publication year - 2021
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/sdtp.14653
Subject(s) - oled , common emitter , optoelectronics , materials science , tandem , diode , dopant , luminance , quantum efficiency , doping , optics , nanotechnology , physics , layer (electronics) , composite material
Organic light‐emitting diodes (OLEDs) are a promising light‐emitting technology useful for various display applications 1,2 . Despite great progress in this field 3−12 , 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). Further, with sophisticated control of device architectures and materials combination, we report improved OLEDs.