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Phosphorescent OLEDs: Enabling energy‐efficient lighting with improved uniformity and longer lifetime
Author(s) -
Levermore Peter A.,
Pang Huiqing,
Dyatkin Alexey B.,
Elshenawy Zeinab,
Mandlik Prashant,
Rajan Kamala,
Silvernail Jeffrey,
Kwong Raymond C.,
Ma Ruiqing,
Weaver Michael S.,
Hack Mike,
Brown Julie J.
Publication year - 2011
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid19.12.943
Subject(s) - phosphorescence , oled , materials science , optoelectronics , diode , flat panel , flat panel display , optics , physics , nanotechnology , fluorescence , layer (electronics)
— In this paper, the design criteria for scaling up from small‐area organic light‐emitting‐diode (OLED) pixels to large‐area OLED light panels is described. Particular focus is placed on using phosphorescent OLEDs (PHOLEDs) to maximize panel efficacy and uniformity and minimize operating temperature. Data for a pair of all‐phosphorescent 15 × 15 cm OLED light panels are also presented: Panel 1 has 62‐lm/W efficacy, CRI = 81, CCT = 3180K, and lifetime to LT70 = 18,000 hours at 1000 cd/m 2 and Panel 2 has 58‐lm/W efficacy, CRI = 82, CCT = 2640K, and lifetime to LT70 = 30,000 hours at 1000 cd/m 2 . Operating at a 3000 cd/m 2 (7740 lm/m 2 ), Panel 2 has 49‐lm/W efficacy with lifetime to LT70 = 4000 hours. Excellent panel lifetime is enabled by a stable light‐blue phosphorescent materials system and by the use of efficient phosphorescent emitters that ensure very low panel temperature without any additional thermal management.