title: Laser-Scanned Programmable Color Temperature of Electroluminescence from White Light-Emitting Electrochemical Cells.
abstract: Recently, the control of correlated color temperature (CCT) of artificial solid-state white-light sources starts to attract more attention since CTs affect human physiology and health profoundly. In this work, we proposed and demonstrated a method that can widely tune the CCTs of electroluminescence (EL) from white-light-emitting electrochemical cells (LECs) by employing plasmonic filters. These integrated on-chip plasmonic filters are composed of semicontinuous thin Ag film or Ag nanoparticles (NPs) both included in the indium tin oxide anode contact, which have different characteristics of plasmonic resonant absorptions that can tune the EL spectra of white LECs. The CCTs of EL from white LECs integrated with semicontinuous thin Ag film and randomly distributed Ag NPs are 5778 and 2350 K, respectively. A commercially available laser scanning system was used to locally thermal anneal the semicontinuous thin Ag film to form the randomly distributed Ag NPs on the scanned areas. Hence, these two kinds of filters can be integrated on the same chip of white LEC, giving more freedom to control the CCTs of white EL and more potential applications. In addition, the laser scanning system used here is quite often used in display manufactures so that our proposed method can be immediately adopted by the light-emitting diode industry.
authors.forename: Hsiao-Chin
authors.initials: HC
authors.lastname: Lee
authors.forename: Chien-Ming
authors.initials: CM
authors.lastname: Fan Chiang
authors.forename: Po-Yi
authors.initials: PY
authors.lastname: Wu
authors.affiliation: Institute of Electro-Optical Science and Technology, National Taiwan Normal University , 88, Sec.4, Ting-Chou Road, Taipei 116, Taiwan.
authors.forename: Yung-Chi
authors.initials: YC
authors.lastname: Yao
authors.affiliation: Department of Chemistry, National Taiwan University , Taipei 10617, Taiwan.
authors.forename: Monima
authors.initials: M
authors.lastname: Sarma
authors.forename: Zu-Po
authors.initials: ZP
authors.lastname: Yang
authors.forename: Hai-Ching
authors.initials: HC
authors.lastname: Su
authors.affiliation: Institute of Electro-Optical Science and Technology, National Taiwan Normal University , 88, Sec.4, Ting-Chou Road, Taipei 116, Taiwan.
authors.forename: Ya-Ju
authors.initials: YJ
authors.lastname: Lee
authors.affiliation: Department of Chemistry, National Taiwan University , Taipei 10617, Taiwan.
authors.forename: Ken-Tsung
authors.initials: KT
authors.lastname: Wong
keywords: color temperature; light-emitting electrochemical cells; nanoparticles; plasmonic filter; white light