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83‐1: Invited Paper: Optimization of High Performance Deep Red OLEDs Using Tandem Structure for Automotive Lighting Application
Author(s) -
Pang Huiqing,
Gao Liang,
Xie Menglan,
Lu Nannan,
Kwong Ray,
Xia Sean
Publication year - 2020
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.14105
Subject(s) - tandem , common emitter , oled , optoelectronics , materials science , quantum efficiency , chromaticity , phosphorescence , wavelength , optics , layer (electronics) , physics , nanotechnology , composite material , fluorescence
We report here high performance deep red OLED devices for automotive lighting applications, through optimizing the organic stacks in a tandem structure. We first developed a deep red phosphorescent emitter that has a PL peak wavelength at 639 nm. A 2‐unit device incorporating this emitter along with a novel charge‐generation layer, was tuned to achieve an external quantum efficiency of 48%, a current efficiency of 26 cd/A, LT95 of 11,000 hrs, and a bias voltage of 8.2 V at 2,000 cd/m 2 . This tandem device reaches a deep red chromaticity with a dominant wavelength of 625nm, and CIE (X, Y) = (0.70, 0.30), as well as a near‐Lambertian emission pattern.