Energy transfer in LaMgB5O10:Pr3+,Mn2+ under VUV excitation

Fu, Yibing; Zhang, Guobin; Qi, Zeming; Wu, Weiwei; Shi, Chaoshu

doi:10.1016/j.jlumin.2006.04.002

Cited by 21 publications

(13 citation statements)

References 16 publications

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“…The energy transfer process is very common in many Mnactivated phosphors, such as CaSiO 3 :Pb,Mn, Ca 3 (PO 4 ) 2-Ca(F,Cl) 2 :Sb,Mn, Ca 2 MgSi 2 O 7 :Eu,Mn, NaBr:Sn,Mn, and LaMgB 5 O 10 :Pr,Mn [13,[28][29][30]. From the excitation spectra of ZnS:0.040%Cu,1.0%Mn and ZnS:0.040%Cu,1.5%Mn phosphors obtained by monitoring the emission at 580 nm, it can be concluded that the sensitization is quite efficient because the excitation intensity remains almost constant in the range of 345-385 nm and is comparable to that of the host excitation.…”

Section: Article In Pressmentioning

confidence: 99%

Photophysical and photoluminescence properties of co-activated ZnS:Cu,Mn phosphors

Wang

Huang

Xia

et al. 2008

Journal of Luminescence

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Section: Article In Pressmentioning

confidence: 99%

Photophysical and photoluminescence properties of co-activated ZnS:Cu,Mn phosphors

Wang

Huang

Xia

et al. 2008

Journal of Luminescence

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“…ions, it shows a broad emission spectrum which can vary from green to deep red [20]. Zhang et al [9] reported that due to several absorption transitions within the 3d 5 [36,37]. Based on the aforesaid reasons, we have investigated the influence of Mn 2?…”

Section: Fluorescence Concentration Quenchingmentioning

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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“…It is indicated that the emission intensity of Mn 2+ is enhanced with the increase of the Mn 2+ ion concentration and reaches the maximum at 0.1 (wt%) of Mn 2+ salt (Fuhai Su et al 2001;Yibing Fu et al 2007;Quan Li et al 2006). Fluorescence spectroscopy is a technique for evaluating the physical and chemical properties of a substance by analyzing the intensity and characteristics of light emitted in the form of fluorescence.…”

Section: K Naveen Kumar and S Buddhudumentioning

confidence: 99%

Enhanced Photoluminescence of Mn2+ + Tb3+ Ions Doped Peo+pvp Blended Polymer Films

Kumar¹,

Buddhudu²

2014

Proceedings of the Indian National Science Academy

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Polymer blended films of PEO+PVP and singly doped and co-doped with Mn 2+ and Tb 3+ i o n s h a v e b e e n s y n t h e s i z e d b y solution casting method. Structural, thermal and optical properties of these films have been carried out. Thermal stability of these films has been investigated based on the measurement of TG-DTA profiles. Raman analysis demonstrates the complex formation of the polymer with the dopant ions. The optical absoption spectra of Mn 2+ a n d T b 3+ s e p e r a t e l y d o p e d polymers exhibits characteristic bands in octahedral symmetry. From the emission spectrum, two emission bands at 510nm (green) and 614nm (red) are attributed to the 4 T 1 6 A 1 , and 4 A 1 6 A 1 transition of Mn 2+ :PEO+PVP polymer fi l ms u n d er 3 7 0 n m exci t at i o n . In Tb 3+ d o p e d P E O + P V P p o l y m e r s a m p l e s e x h i b i t g r e e n e m i s s i o n a t 5 4 6 n m ( g r e e n ) d u e t o a transition of ( 5 D 4 7 F 5 ) under 370nm excitation. The enhanced r e d emission at 614nm of Mn 2+ ions is attributed to an effective energy transfer of Tb 3+ M n 2+ ions in the co-doped blended polymer film, which has been evidenced from the measurement of luminescence spectra and emission decay dynamics. These polymeric materials are suggested as bright visible colour luminescent materials.

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Energy transfer in LaMgB5O10:Pr3+,Mn2+ under VUV excitation

Cited by 21 publications

References 16 publications

Photophysical and photoluminescence properties of co-activated ZnS:Cu,Mn phosphors

Photophysical and photoluminescence properties of co-activated ZnS:Cu,Mn phosphors

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

Enhanced Photoluminescence of Mn2+ + Tb3+ Ions Doped Peo+pvp Blended Polymer Films

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