title: Facile Atmospheric Pressure Synthesis of High Thermal Stability and Narrow-Band Red-Emitting SrLiAl3N4:Eu(2+) Phosphor for High Color Rendering Index White Light-Emitting Diodes.
abstract: Red phosphors (e.g., SrLiAl3N4:Eu(2+)) with high thermal stability and narrow-band properties are urgently explored to meet the next-generation high-power white light-emitting diodes (LEDs). However, to date, synthesis of such phosphors remains an arduous task. Herein, we report, for the first time, a facile method to synthesize SrLiAl3N4:Eu(2+) through Sr3N2, Li3N, Al, and EuN under atmospheric pressure. The as-synthesized narrow-band red-emitting phosphor exhibits excellent thermal stability, including small chromaticity shift and low thermal quenching. Intriguingly, the title phosphor shows an anomalous increase in theoretical lumen equivalent with the increase of temperature as a result of blue shift and band broadening of the emission band, which is crucial for high-power white LEDs. Utilizing the title phosphor, commercial YAG:Ce(3+), and InGaN-based blue LED chip, a proof-of-concept warm white LEDs with a color rendering index (CRI) of 91.1 and R9 = 68 is achieved. Therefore, our results highlight that this method, which is based on atmospheric pressure synthesis, may open a new means to explore narrow-band-emitting nitride phosphor. In addition, the underlying requirements to design Eu(2+)-doped narrow-band-emitting phosphors were also summarized.
authors.affiliation: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.
authors.forename: Xuejie
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, National Taiwan University , Taipei 106, Taiwan.
authors.forename: Yi-Ting
authors.initials: YT
authors.lastname: Tsai
authors.affiliation: National Chung-Shan Institute Science & Technology, Chemical Systems Research Division , Taoyuan 325, Taiwan.
authors.forename: Shin-Mou
authors.initials: SM
authors.lastname: Wu
authors.affiliation: National Chung-Shan Institute Science & Technology, Chemical Systems Research Division , Taoyuan 325, Taiwan.
authors.forename: Yin-Chih
authors.initials: YC
authors.lastname: Lin
authors.affiliation: National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan.
authors.forename: Jyh-Fu
authors.initials: JF
authors.lastname: Lee
authors.affiliation: National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan.
authors.forename: Hwo-Shuenn
authors.initials: HS
authors.lastname: Sheu
authors.affiliation: National Synchrotron Radiation Research Center , Hsinchu 300, Taiwan.
authors.forename: Bing-Ming
authors.initials: BM
authors.lastname: Cheng
authors.affiliation: 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.forename: Ru-Shi
authors.initials: RS
authors.lastname: Liu
keywords: high thermal stability; high-CRI; narrow-band-emitting; red nitride phosphor; white LEDs