Spectroscopic properties of Pr3+:SrMoO4 crystal

Cao, Jiafeng; Wang, Yan; Ma, Xinghua; Li, Jianfu; Zhu, Ziming; You, Zhenyu; Yang, Fugui; Sun, Chaomin; Cao, Ting; Ji, Yuexia

doi:10.1016/j.jallcom.2010.09.029

Cited by 25 publications

(7 citation statements)

References 22 publications

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“…The visible luminescence of Pr 3+ ion transitions requires appropriate host materials when excited with UV wavelengths corresponding to 4 fn-1 5d. [94][95][96] The ground-state of these kinds of ions is characterized by Xe-4f 3 6s 2 valence electrons and PL properties of Pr 3+ ions are ascribed to a 4f 1 5d 1 transition. 97 According to Raju et al, 98 the first electronic transition is ascribed to ( 3 P 2 A 3 H 4 ), and the second transition corresponds to ( 3 P 1 A 3 H 4 ).…”

Section: Pl Emission Energy Diagram Levels (Pr 3+mentioning

confidence: 99%

Structural refinement, growth process, photoluminescence and photocatalytic properties of (Ba1-xPr2x/3)WO4 crystals synthesized by the coprecipitation method

et al. 2012

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Barium praseodymium tungstate (Ba 1-x Pr 2x/3 )WO 4 crystals with (x = 0, 0.01, and 0.02) were prepared by the coprecipitation method. These crystals were structurally characterized by X-ray diffraction (XRD), Rietveld refinements, Fourier-transform Raman (FT-Raman) and Fourier-transform infrared (FT-IR) spectroscopies. The shape and size of these crystals were observed by field emission scanning electron microcopy (FE-SEM). Their optical properties were investigated by ultraviolet visible (UV-vis) absorption and photoluminescence (PL) measurements. Moreover, we have studied the photocatalytic (PC) activity of crystals for degradation of rhodamine B (RhB) dye. XRD patterns, Rietveld refinements data, FT-Raman and FT-IR spectroscopies indicate that all crystals exhibit a tetragonal structure without deleterious phases. FT-Raman spectra exhibited 13 Raman-active modes in a range from 50 to 1000 cm 21 , while FT-IR spectra have 8 infrared active modes in a range from 200 to 1050 cm 21 . FE-SEM images showed different shapes (bonbon-, spindle-, rice-and flake-like) as well as a reduction in the crystal size with an increase in Pr 3+ ions. A possible growth process was proposed for these crystals. UV-vis absorption measurements revealed a decrease in optical band gap values with an increase of Pr 3+ into the matrix. An intense green PL emission was noted for (Ba 1-x Pr 2x/3 )WO 4 crystals (x = 0), while crystals with (x = 0.01 and 0.02) produced a reduction in the wide band PL emission and the narrow band PL emission which is related to f-f transitions from Pr 3+ ions. High photocatalytic efficiency was verified for the bonbon-like BaWO 4 crystals as a catalyst in the degradation of the RhB dye after 25 min under UV-light. Finally, we discuss possible mechanisms for PL and PC properties of these crystals.

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Section: Pl Emission Energy Diagram Levels (Pr 3+mentioning

confidence: 99%

Structural refinement, growth process, photoluminescence and photocatalytic properties of (Ba1-xPr2x/3)WO4 crystals synthesized by the coprecipitation method

et al. 2012

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“…Because, Pr 3? activated materials have engrossed much attention and used in several potential applications, such as fiber optical communications, UV and visible lasers, upconversion lasers, optoelectronic devices, field emission display devices, lamp phosphors and improving solar cell efficiency [11][12][13][14][15][16]. Pr 3?…”

Section: Introductionmentioning

confidence: 99%

Enhanced luminous efficiency in Pr3+ activated Ca0.5La(MoO4)2 red phosphor with blue excitation for WLED applications

Krishnan

Thirumalai

Mahalingam

et al. 2015

J Mater Sci: Mater Electron

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In this article, we have investigated the downconversion luminescence properties of Ca 0.5 La(MoO 4 ) 2 doped with trivalent Pr 3? (substitute for La 3? site) and codoped with Mn 2? (substitute for Ca 2? site). The powder X-ray diffraction patterns confirm that the single crystalline phosphor powders belong to the scheelite-type tetragonal crystal structure. The photoluminescence (PL) excitation spectra of Ca 0.5 La(MoO 4 ) 2 :Pr 3? exhibits a charge transfer band centered at 276 nm along with three intense sharp absorption bands identified at 449, 475, and 488 nm which are attributed to the f-f electronic transitions of of Pr 3? , respectively. Upon optical excitation, the depopulation of excited 3 P 0 level into the 3 F 2 lower levels of Pr 3? is governed by radiative transfer of energy, as a result, high intense red emission peak was observed at 647 nm. The change in PL emission intensity as a function of Pr 3? concentrations, Mn 2? concentrations, and different excitation wavelengths have been investigated in detail. Further, the codoping of alkali metal chlorides MCl (M = Na, K, Li) into the Ca 0.5 La(MoO 4 ) 2 :Pr 3? phosphor greatly improves the luminescence intensity of the transition 3 P 0 ? 3 F 2 which can be explained by charge compensation effect. To ensure the colour richness and quality of its emission, the photometric parameters were estimated using spectral energy distribution functions of Ca 0.5 La(MoO 4 ) 2 :Pr 3? .The luminous efficacy of radiation for NaCl codoped Ca 0.5 La(MoO 4 ) 2 :Pr 3? phosphor was estimated to be 154 lm/W and the percentage of luminous efficiency is 23 %.

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“…Sixteen main laser transitions have been reported within its emission range. The emission channels corresponding to 1 D 2 -3 H 4 (red) and 3 P 0 -3 H 4 (Greenish Blue) transitions are the dominating emission in the visible range [1]. Laser emission and optical parametric transitions depend on the host materials; these ions were doped with various host materials to increase the visible emission efficiency.…”

Section: Introductionmentioning

confidence: 99%

Growth, vibrational and luminescence analysis of monoclinic KGd(1−x)Prx(WO4)2 (x=0.005, 0.02, 0.05) single crystals

Thangaraju¹,

Babu²,

Durairajan³

et al. 2013

Journal of Crystal Growth

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Spectroscopic properties of Pr3+:SrMoO4 crystal

Cited by 25 publications

References 22 publications

Structural refinement, growth process, photoluminescence and photocatalytic properties of (Ba1-xPr2x/3)WO4 crystals synthesized by the coprecipitation method

Structural refinement, growth process, photoluminescence and photocatalytic properties of (Ba1-xPr2x/3)WO4 crystals synthesized by the coprecipitation method

Enhanced luminous efficiency in Pr3+ activated Ca0.5La(MoO4)2 red phosphor with blue excitation for WLED applications

Growth, vibrational and luminescence analysis of monoclinic KGd(1−x)Prx(WO4)2 (x=0.005, 0.02, 0.05) single crystals

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