Improving thermal stability of novel single-component white-light emitting phosphor Ca8MgLu(PO4)(7):Tm3+, Dy-3(+) by back-energy-transfer | Научно-инновационный портал СФУ

Improving thermal stability of novel single-component white-light emitting phosphor Ca8MgLu(PO4)(7):Tm3+, Dy-3(+) by back-energy-transfer

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1016/j.jlumin.2020.117516

Ключевые слова: single-phase white-light emitting phosphor, ca8mglu(po4)(7):tm3+, dy-3(+), back-energy-transfer, highly thermal stability

Аннотация: The light degradation of WLED devices after long-time use has been proved to be mainly caused by thermal quenching of phosphors, therefore, the design of single-component white-light emitting phosphors with high thermal stability remains a huge challenge. A novel single-phase white light-emitting phosphor Ca8MgLu(PO4)(7):Tm3+, Dy-3(+) was designed and prepared in this work. The photoluminescent results show that white light emission from the phosphor can be achieved by controlling the ratio of Tm3+ and Dy3+ to adjust the relative intensity of the emission at 451 nm of Tm3+ and the emissions at 488, 571 and 660 nm of Dy3+. The luminescence decay results reveal that there is energy transfer from Tm3+ to Dy3+ in Ca8MgLu(PO4)(7):Tm3+,Dy3+ and the efficiency of energy transfer between the two dopants reaches as much as 55%. Temperature-dependent luminescent analyses suggest the highly stable emission of Ca8MgLu0.76(PO4)(7):0.12Tm(3+),0.12Dy(3+) as the integrated emission intensity of the phosphor at 475 K reduces only about 13% of that at room temperature, which is due to the back-energy-transfer from highly doped Dy3+ to Tm3+ that compensates the luminescence energy. This single-phase white-light emitting phosphor exhibits superior color and luminescence stability and thus may find a potential application in WLEDs.

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Издание

Журнал: JOURNAL OF LUMINESCENCE

Выпуск журнала: Vol. 227

Номера страниц: 117516

ISSN журнала: 00222313

Место издания: AMSTERDAM

Издатель: ELSEVIER

Авторы

  • Xie Feiyan (Huizhou Univ, Sch Chem & Mat Engn, Huizhou 516007, Peoples R China; Sun Yat Sen Univ, Sch Chem, Key Lab Bioinorgan & Synthet Chem, Minist Educ, Guangzhou 510275, Peoples R China)
  • Xu Dekang (Huizhou Univ, Sch Chem & Mat Engn, Huizhou 516007, Peoples R China)
  • Wu Zhanchao (Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, Qingdao 266042, Peoples R China)
  • Molokeev Maxim S. (SB RAS, Kirensky Inst Phys, RU-660036 Krasnoyarsk, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)
  • Milicevic Bojana (Sun Yat Sen Univ, Sch Chem, Key Lab Bioinorgan & Synthet Chem, Minist Educ, Guangzhou 510275, Peoples R China)
  • Li Hao (Huizhou Univ, Sch Chem & Mat Engn, Huizhou 516007, Peoples R China)
  • Shi Jianxin (Sun Yat Sen Univ, Sch Chem, Key Lab Bioinorgan & Synthet Chem, Minist Educ, Guangzhou 510275, Peoples R China)

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