Open AccessBis‐Tridentate Iridium(III) Phosphors with Very High Photostability and Fabrication of Blue‐Emitting OLEDs
Author(s) -
Kuo HsinHung,
Zhu Zelin,
Lee ChunSing,
Chen YiKuang,
Liu ShihHung,
Chou PiTai,
Jen Alex K.Y.,
Chi Yun
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.201800846
Subject(s) - iridium , phosphor , oled , quantum efficiency , materials science , optoelectronics , toluene , fabrication , photochemistry , diode , blue light , chemistry , nanotechnology , organic chemistry , layer (electronics) , catalysis , medicine , alternative medicine , pathology
Sky‐blue and blue‐emitting, carbazolyl functionalized, bis‐tridentate Ir(III) phosphors Cz‐1 – Cz‐3 with bright emission and short radiative lifetime are successfully synthesized in a one‐pot manner. They exhibit very high photostability against UV–vis irradiation in degassed toluene, versus both green and true‐blue‐emitting reference compounds, i.e., fac ‐[Ir(ppy) 3 ] and mer ‐[Ir(pmp) 3 ]. Organic light‐emitting diodes (OLEDs) based on Cz‐2 exhibit maximum external quantum efficiency (EQE) of 21.6%, EQE of 15.1% at 100 cd m −2 , and with CIE x , y coordinates of (0.17, 0.25). This study provides a conceptual solution to the exceedingly stable and efficient blue phosphor. It is promising that long lifespan blue OLED based on these emitters can be attained with further engineering of devices suitable for commercial application.