Fang M.-HLin J.-CHuang W.-TMajewska NBarzowska JMahlik SPang W.KLee J.-FSheu H.-SRU-SHI LIU2022-04-252022-04-25202108974756https://www.scopus.com/inward/record.uri?eid=2-s2.0-85117122794&doi=10.1021%2facs.chemmater.1c02990&partnerID=40&md5=0b1e9710fddbcd39a12da0538deb444ahttps://scholars.lib.ntu.edu.tw/handle/123456789/606930Eu2+-doped UCr4C4-type oxynitride phosphors are emerging innovative materials to replace oxide and nitride phosphors for high-end light-emitting devices. However, the synthesis of high-purity phosphors and controlling the O/N ratio remain challenging. Here, we synthesized a series of Sr0.98Li2.5 + zAl1.5 - zO3 + 2zN1 - 2z:0.02Eu phosphors by precursor engineering, and these products showed an unexpected redshift from 583 to 620 nm. Joint refinement combining synchrotron X-ray diffraction and neutron powder diffraction was conducted to determine macro-structural properties. Extended X-ray absorption fine structure spectra revealed the micro-structural properties around the luminescent centers. The effects on photoluminescence from the first-shelled O/N ligands and the second-shelled Li/Al ions were demonstrated in detail. Finally, the light-emitting diode packages constructed using our phosphor revealed higher luminous efficiency of radiation and luminous efficacy than the SrLiAl3N4:Eu comparator. This study provided the basis for developing novel oxynitride phosphors and insights into the structural analysis from the macro and micro perspectives. ? 2021 American Chemical Society.LightLuminescenceNitridesPhosphorsStructural analysisStructural propertiesX ray absorptionX ray diffractionHigh purityInnovative materialsLight-emitting deviceLightemitting diodeLuminescence controlsMicro-structuralNitride phosphorOxide phosphorsOxynitride phosphorSynthesisedLight emitting diodes[SDGs]SDG7[SDGs]SDG9journal article10.1021/acs.chemmater.1c029902-s2.0-85117122794