Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.1039/d0dt00931h

Аннотация: Blue light pumped red luminescence with broadband and high photon-energy emission is highly desired for phosphor-converted white light-emitting diodes (pc-wLEDs), to achieve a high color rendering index and high luminous efficacy. Mn4+-doped red-emitting phosphors generally exhibit sharp vibronic emissions associated with the parity- and spin-forbidden E-2(g) -> (4)A(2g) transitions. In this paper, two abnormal luminescence behaviors were observed for Mn4+ in the MgAl2O4:Mn4+ spinel phosphor with a short wavelength emission band peaking at 651 nm. Firstly, the Mn4+ 2Eg -> (4)A(2g) transition exhibits ultrabroadband luminescence in MgAl2O4 and the large full-width at half-maximum (FWHM) is dependent both on the calcination temperature and on the partial substitution of Al3+ with Ga3+. Secondly, the thermal quenching behavior of the Mn4+ 2Eg -> (4)A(2g) luminescence in MgAl2O4 shows a dependence on its thermal treatment and preparation method. The Rietveld refinement and Raman results demonstrate that the variation in the FWHM of the luminescence spectra is a sum effect of structural ordering (i.e., isotropic displacement decrease of constituent atoms) and the Mg Al anti-site disorder. A model for the observed varying thermal quenching of luminescence was tentatively proposed. The intrinsic thermal quenching temperature of Mn4+ luminescence in MgAl2O4 was found to be 390-400 K using the samples prepared by the co-precipitation and molten salt methods. The present work gives a novel perspective to understand the luminescence spectra of Mn4+ 2Eg -> (4)A(2g) transition.

Журнал: DALTON TRANSACTIONS

Выпуск журнала: Vol. 49, Is. 17

Номера страниц: 5711-5721

ISSN журнала: 14779226

Место издания: CAMBRIDGE

Издатель: ROYAL SOC CHEMISTRY

• Ji Haipeng (Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China)
• Hou Xinghui (Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China)
• Molokeev Maxim S. (Fed Reseals Ctr KSC SR RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Krasnoyarsk 660041, Russia)
• Ueda Jumpei (Kyoto Univ, Grad Sch Human & Environm Studies, Kyoto 6068501, Japan)
• Tanabe Setsuhisa (Kyoto Univ, Grad Sch Human & Environm Studies, Kyoto 6068501, Japan)
• Brik Mikhail G. (Chongqing Univ Posts & Telecommun, CQUPT BUL Innovat Inst, Chongqing 400065, Peoples R China; Chongqing Univ Posts & Telecommun, Coll Sci, Chongqing 400065, Peoples R China; Univ Tartu, Inst Phys, EE-50411 Tartu, Estonia)
• Zhang Zongtao (Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China)
• Wang Yu (Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China)
• Chen Deliang (Zhengzhou Univ, Sch Mat Sci & Engn, Zhengzhou 450001, Peoples R China; Dongguan Univ Technol, Sch Mat Sci & Engn, Dongguan 523808, Peoples R China)

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