Open AccessA highly color-stability white organic light-emitting diode by color conversion within hole injection layer
Author(s) -
C. Li,
Musubu Ichikawa,
Bin Wei,
Yoshio Taniguchi,
Hiroshi Kimura,
K. Kawaguchi,
K. Sakurai
Publication year - 2007
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.000608
Subject(s) - electroluminescence , materials science , fluorescence , optoelectronics , oled , layer (electronics) , diode , optics , photoluminescence , doping , light emitting diode , physics , nanotechnology
We demonstrated a novel-structure white organic light-emitting devices (WOLEDs) composed of a greenish blue fluorescent emitting layer and a red fluorescent dye-doped hole injection layer. The spectra of WOLEDs show no change at a wide range current density operation and long-term continuous operation. We concluded that carriers recombined inside the emitting layer in the WOLEDs to produce a greenish blue electroluminescence (EL), and a part of the EL was absorbed by the red fluorescent guest doped hole injection layer and converted into red photoluminescence (PL); the whole white emission from the device was a mixture of the greenish blue EL and red PL.