Discovery of blue-emitting Eu2+-activated sodium aluminate phosphor with high thermal stability via phase segregation

被引：36

作者：

Zhang, Xujian ^{[1
,2
]}

Zhang, Jilin ^{[1
,2
]}

Wu, Xiangli ^{[1
,2
]}

Yu, Liping ^{[1
,2
]}

Liu, Yongfu ^{[3
]}

Xu, Xuhui ^{[4
]}

Lian, Shixun ^{[1
,2
]}

机构：

[1] Hunan Normal Univ, Minist Educ China, Key Lab Sustainable Resources Proc, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Peoples R China

[2] Hunan Normal Univ, Adv Mat Hunan Prov Coll, Changsha 410081, Peoples R China

[3] Chinese Acad Sci, NIMTE, Ningbo 315201, Peoples R China

[4] Kunming Univ Sci & Technol, Coll Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2020年 / 388卷

基金：

中国国家自然科学基金;

关键词：

Thermal stability; Phosphor; Photoluminescence; Phase segregation; Eu2+; RED PHOSPHORS; LUMINESCENCE PROPERTIES; QUANTUM EFFICIENCY; CRYSTAL-STRUCTURE; PLANT-GROWTH; EMISSION; PHOTOLUMINESCENCE; MN2+; CE3+; DESIGN;

D O I：

10.1016/j.cej.2020.124289

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Thermally stable phosphors are crucial for the application in phosphor-converted white light-emitting diodes. This paper reports the evolution of phase compositions in nominal Na2-xAl2B2O7:xEu (x = 0.02-2.0) upon replacing Na atoms by Eu atoms. Eu2+-activated blue-emitting phosphor was discovered through phase segregation combined with related analyses. The structure, phase composition and related luminescent properties were investigated by X-ray powder diffraction, backscattered electron image combined with elemental mapping, cathodoluminescence-combined scanning electron microscope, and temperature-dependent emission spectra, etc. Analyses results suggest that EuBO3 phase segregates upon the gradual replacement of Na by Eu atoms, which is accompanied by phase transformation from Na2Al2B2O7:Eu2+ to NaAl11O17:Eu2+ and dramatic enhancement of blue emission. The broad emission band is peaking at around 470 nm under UV irradiation. The internal quantum efficiencies of nominal Na0.4Al2B2O7:1.6Eu and Na0.2Al(2)B(2)O(7):1.8Eu are 58.6% and 60.2%, respectively, which contain both NaAl11O17 and EuBO3 phase. The emission intensity for these two samples at 150 degrees C remains 96% (x = 1.6) and 83% (x = 1.8) of the room-temperature values, respectively.

引用

页数：9

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