title: Enhance Color Rendering Index via Full Spectrum Employing the Important Key of Cyan Phosphor.
abstract: A new concept called "full-spectrum lighting" has attracted considerable attention in recent years. Traditional devices are usually combined with ultraviolet-light-emitting diode (LED), red, green, and blue phosphors. However, a cyan cavity exists in the 480-520 nm region. Hence, cyan phosphors are needed to compensate for the cavity. (Sr,Ba)5(PO4)3Cl:Eu2+phosphors feature an extremely unique and tunable photoluminescence spectrum. Nevertheless, the tuning mechanisms of these phosphors remain unclear. In this study, we elucidate the mechanism of the cation size-controlled activator uneven-occupation and reoxidation in (Sr,Ba)5(PO4)3Cl:Eu2+phosphors. This mechanism could help tune the optical properties of related apatite families and structures with multiple cation sites and strongly uneven occupation of activators and cations. Finally, the package of the LED device is constructed to show that both color rendering index Ra and R9 are higher than 95. Thus, the device could be a potential candidate for full-spectrum lighting.
authors: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.
authors: Mu-Huai
authors: MH
authors: Fang
authors: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.
authors: Chenchen
authors: C
authors: Ni
authors: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.
authors: Xuejie
authors: X
authors: Zhang
authors: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.
authors: Yi-Ting
authors: YT
authors: Tsai
authors: Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk , 80-308 Gdańsk, Poland.
authors: Sebastian
authors: S
authors: Mahlik
authors: Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk , 80-308 Gdańsk, Poland.
authors: Agata
authors: A
authors: Lazarowska
authors: Institute of Experimental Physics, Faculty of Mathematics, Physics and Informatics, University of Gdańsk , 80-308 Gdańsk, Poland.
authors: Marek
authors: M
authors: Grinberg
authors: National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan.
authors: Hwo-Shuenn
authors: HS
authors: Sheu
authors: National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan.
authors: Jyh-Fu
authors: JF
authors: Lee
authors: National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan.
authors: Bing-Ming
authors: BM
authors: Cheng
authors: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.|Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology , Taipei 106, Taiwan.
authors: Ru-Shi
authors: RS
authors: Liu
keywords: LED; M5(PO4)3Cl; activator redistribution; cyan phosphor; full spectrum