title: Enabling a blue-hazard free general lighting based on candle light-style OLED.
abstract: Increasing studies report blue light to possess a potential hazard to the retina of human eyes, secretion of melatonin and artworks. To devise a human- and artwork-friendly light source and to also trigger a "Lighting Renaissance", we demonstrate here how to enable a quality, blue-hazard free general lighting source on the basis of low color-temperature organic light emitting diodes. With the use of multiple candlelight complementary emitters, the sensationally warm candle light-style emission is proven to be also drivable by electricity. To be energy-saving, highly efficient candle-light emission is demanded. The device shows, at 100 cd m-2for example, an efficacy of 85.4 lm W-1, an external quantum efficiency of 27.4%, with a 79 spectrum resemblance index and 2,279 K color temperature. The high efficiency may be attributed to the candlelight emitting dyes with a high quantum yield, and the host molecules facilitating an effective host-to-guest energy transfer, as well as effective carrier injection balance.
authors.forename: Jwo-Huei
authors.initials: JH
authors.lastname: Jou
authors.forename: Sudhir
authors.initials: S
authors.lastname: Kumar
authors.forename: Chih-Chia
authors.initials: CC
authors.lastname: An
authors.forename: Meenu
authors.initials: M
authors.lastname: Singh
authors.forename: Huei-Huan
authors.initials: HH
authors.lastname: Yu
authors.forename: Chun-Yu
authors.initials: CY
authors.lastname: Hsieh
authors.forename: You-Xing
authors.initials: YX
authors.lastname: Lin
authors.forename: Chao-Feng
authors.initials: CF
authors.lastname: Sung
authors.forename: Ching-Wu
authors.initials: CW
authors.lastname: Wang
mesh_terms: D003116:Color; D004581:Electronics / Q000295:instrumentation*; D008027:Light; D008029:Lighting / Q000295:instrumentation*; D053758:Nanoparticles / Q000737:chemistry; D013696:Temperature