Open AccessElectroplex as a New Concept of Universal Host for Improved Efficiency and Lifetime in Red, Yellow, Green, and Blue Phosphorescent Organic Light‐Emitting Diodes
Author(s) -
Song Wook,
Lee Jun Yeob,
Cho Yong Joo,
Yu Hyeonghwa,
Aziz Hany,
Lee Kang Mun
Publication year - 2018
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201700608
Subject(s) - phosphorescence , host (biology) , oled , diode , optoelectronics , materials science , phosphorescent organic light emitting diode , carbazole , light emitting diode , excimer , photochemistry , chemistry , nanotechnology , fluorescence , optics , physics , biology , ecology , layer (electronics)
A new concept of host, electroplex host, is developed for high efficiency and long lifetime phosphorescent organic light‐emitting diodes by mixing two host materials generating an electroplex under an electric field. A carbazole‐type host and a triazine‐type host are selected as the host materials to form the electroplex host. The electroplex host is found to induce light emission through an energy transfer process rather than charge trapping, and universally improves the lifetime of red, yellow, green, and blue phosphorescent organic light‐emitting diodes by more than four times. Furthermore, the electroplex host shows much longer lifetime than a common exciplex host. This is the first demonstration of using the electroplex as the host of high efficiency and long lifetime phosphorescent organic light‐emitting diodes.