Multi-wavelength excitable europium-doped borosilicate glasses for orangered emission:composition-induced structure and valence variation  

作　　者：仇坤 田华 宋俊 毛智勇 王达健 

机构地区：[1]School of Materials Science & Engineering,Tianjin University of Technology [2]Shanghai Institute of Ceramics,Chinese Academy of Sciences [3]Key Lab of Display Materials & Photoelectronic Devices Ministry of Education [4]Tianjin Key Lab for Photoelectronic Materials & Devices

出　　处：《Journal of Rare Earths》2012年第5期408-412,共5页稀土学报（英文版）

基　　金：supported by National Natural Science Foundation of China (50872091,51102265);Key Discipline of Materials Physics and Chemis-try (Tianjin,China) (10SYSYJC28100)

摘　　要：Europium-doped borosilicate glasses were prepared by melt-quenching procedure in the air.The mixed valence of Eu 2＋ and Eu 3＋ was identified by photoluminescence spectrum and electron paramagnetic resonance（EPR）.The existence of mixed valence was observed owing to the unequivalent substitution and de-polymerization network of the as-prepared borosilicate glasses.The variation of the glass composition in B 2 O 3 /BaO ratios changed the stability of the Eu 3＋ ions distinctly.In particular,as-prepared borosilicate glasses exhibited a tri-wavelength light excitable spectra centered at 397,466 and 534 nm to give the broadened orange-red emission at around 592 and 617 nm,due to supersensitive transitions of Eu 3＋ ions.This simultaneous tri-wavelength excitation happened to correspond with the emitting wavelength from near ultraviolet,blue AlInGaN chips and that from YAG：Ce 3＋.The total quantum yield（QY） of the Eu-doped glasses under 466 nm excitation was evaluated to be 10%,potentially providing a versatile combination with the europium-doped borosilicate glasses for red component addition to improve the quality of white light.Europium-doped borosilicate glasses were prepared by melt-quenching procedure in the air.The mixed valence of Eu 2＋ and Eu 3＋ was identified by photoluminescence spectrum and electron paramagnetic resonance（EPR）.The existence of mixed valence was observed owing to the unequivalent substitution and de-polymerization network of the as-prepared borosilicate glasses.The variation of the glass composition in B 2 O 3 /BaO ratios changed the stability of the Eu 3＋ ions distinctly.In particular,as-prepared borosilicate glasses exhibited a tri-wavelength light excitable spectra centered at 397,466 and 534 nm to give the broadened orange-red emission at around 592 and 617 nm,due to supersensitive transitions of Eu 3＋ ions.This simultaneous tri-wavelength excitation happened to correspond with the emitting wavelength from near ultraviolet,blue AlInGaN chips and that from YAG：Ce 3＋.The total quantum yield（QY） of the Eu-doped glasses under 466 nm excitation was evaluated to be 10%,potentially providing a versatile combination with the europium-doped borosilicate glasses for red component addition to improve the quality of white light.

关 键 词：borosilicate glasses luminescence valence state europium ion rare earths 

分 类 号：TQ171.1[化学工程—玻璃工业]