Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.3390/cryst10111000

Ключевые слова: double molybdate, microwave sol–gel, spectroscopic properties, upconversion, yellow phosphors

Аннотация: AgGd(MoO4)2:Ho3+/Yb3+ double molybdates with five concentrations of Ho3+ and Yb3+ were synthesized by the microwave employed sol–gel based process (MES), and the crystal structure variation, concentration effects, and spectroscopic characteristics were investigated. The crystal structures of AgGd1-x-yHoxYby(MoO4)2 (x = 0, 0.05; y = 0, 0.35, 0.4, 0.45, 0.5)at room temperature were determined in space group I41 /a by Rietveld analysis. Pure AgGd(MoO4)2 has a scheelite-type structure with mixed occupations of (Ag,Gd) sites and cell parameters a = 5.24782 (11) and c = 11.5107 (3) Å, V = 317.002 (17) Å3, Z = 4. In doped samples, the sites are occupied by a mixture of (Ag,Gd,Ho,Yb) ions, which provides a linear cell volume decrease with the doping level increase. Under the excitation at 980 nm, AGM:0.05Ho,yYb phosphors exhibited a yellowish green emission composed of red and green emission bands according to the strong transitions5F5 →5I8 and5S2/5F4 →5I8 of Ho3+ ions. The evaluated photoluminescence and Raman spectroscopic results were discussed in detail. The upconversion intensity behavior dependent on the Yb/Ho ratio is explained in terms of the optimal number of Yb3+ ions at the characteristic energy transfer distance around the Ho3+ ion. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.

Журнал: Crystals

Выпуск журнала: Vol. 10, Is. 11

Номера страниц: 1-14

ISSN журнала: 20734352

Издатель: MDPI AG

• Lim Chang Sung (Hanseo Univ, Dept Aerosp Adv Mat Engn, Seosan 31962, South Korea)
• Aleksandrovsky Aleksandr (Kirensky Inst Phys Fed Res Ctr KSC SB RAS, Lab Coherent Opt, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Nanotechnol Spect & Quantum Chem, Krasnoyarsk 660041, Russia)
• Atuchin Victor (SB RAS, Lab Opt Mat & Struct, Inst Semicond Phys, Novosibirsk 630090, Russia; Novosibirsk State Univ, Lab Semicond & Dielect Mat, Novosibirsk 630090, Russia; Kemerovo State Univ, Res & Dev Dept, Kemerovo 650000, Russia)
• Molokeev Maxim (Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Lab Crystal Phys, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Inst Engn Phys & Radioelect, Krasnoyarsk 660041, Russia; Far Eastern State Transport Univ, Dept Phys, Khabarovsk 680021, Russia)
• Oreshonkov Aleksandr (Kirensky Inst Phys Fed Res Ctr KSC SB RAS, Lab Mol Spect, Krasnoyarsk 660036, Russia; Siberian Fed Univ, Sch Engn & Construct, Krasnoyarsk 660041, Russia)

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