Open AccessDesign and fabrication of two-stack tandem-type all-phosphorescent white organic light-emitting diode for achieving high color rendering index and luminous efficacy
Author(s) -
Hyunsu Cho,
Chul Woong Joo,
Jonghee Lee,
Hyunkoo Lee,
Jaehyun Moon,
Jeong Ik Lee,
Jun Yeob Lee,
Youngjin Kang,
Nam Sung Cho
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.024161
Subject(s) - color rendering index , luminous efficacy , common emitter , oled , phosphorescence , materials science , optoelectronics , optics , fabrication , diode , high color , luminous flux , color temperature , light emitting diode , physics , fluorescence , nanotechnology , light source , computer science , medicine , alternative medicine , layer (electronics) , pathology , artificial intelligence , color image , image processing , image (mathematics)
White organic light-emitting diodes (WOLEDs) are regarded as the general lighting source. Although color rendering index (CRI) and luminous efficacy are usually in trade-off relation, we will discuss about the optimization of both characteristics, particularly focusing on the spectrum of a blue emitter. The emission at a shorter wavelength is substantially important for achieving very high CRI (> 90). The luminous efficacy of a phosphorescent blue emitter is low as its color falls in the deeper blue range; however, that does not show any significant influence on the WOLEDs. WOLEDs with different blue dopants are compared to confirm the calculation of the CRI and luminous efficacy, and the optimized WOLEDs exhibit luminous efficacy of 38.3 lm/W and CRI of 90.9.