title: Improve efficiency of white organic light-emitting diodes by using nanosphere arrays in color conversion layers.
abstract: The authors demonstrated an efficient color conversion layer (CCL) by using nanosphere arrays in down-converted white organic light-emitting diodes (WOLEDs). The introduced periodical nanospheres not only helped extract the confined light in devices, but also increased the effective light path to achieve high-efficiency color conversion. By applying a CCL with red phosphor on a 400-nm-period nanosphere array, we achieved 137% color conversion ratio for blue OLEDs, which was 2.68 times higher than conventional flat CCL. The resulting luminous efficiency of WOLEDs with patterned CCLs (20.97 cd/A, 1000 cd/m2) was two times higher than the efficiency of the flat device (10.26 cd/A, 1000 cd/m2).
authors.affiliation: Research Center for Applied Sciences, Academia Sinica, Taipei 115, Taiwan.
authors.forename: Yu-Hsuan
authors.initials: YH
authors.lastname: Ho
authors.forename: Ding-Wei
authors.initials: DW
authors.lastname: Huang
authors.forename: Yung-Ting
authors.initials: YT
authors.lastname: Chang
authors.forename: Ya-Han
authors.initials: YH
authors.lastname: Ye
authors.forename: Chih-Wei
authors.initials: CW
authors.lastname: Chu
authors.forename: Wei-Cheng
authors.initials: WC
authors.lastname: Tian
authors.forename: Chin-Ti
authors.initials: CT
authors.lastname: Chen
authors.forename: Pei-Kuen
authors.initials: PK
authors.lastname: Wei
mesh_terms: D003116:Color; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008029:Lighting / Q000295:instrumentation*; D054118:Nanospheres / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation*; D012666:Semiconductors