Intense visible and near infrared upconversion in M2O2S: Er (M=Y, Gd, La) phosphor under 1550nm excitation

Kumar, Gaurav; Pokhrel, Madhab; Sardar, Dhiraj K.

doi:10.1016/j.matlet.2011.10.087

Cited by 83 publications

(46 citation statements)

References 9 publications

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“…5e, f) clearly show that the up-conversion photoluminescence occurs at both the wavelengths of excitation [30][31][32]. This happens due to direct excitation of Er 3?…”

Section: Triple Excitation Properties Of Zno:er 31mentioning

confidence: 81%

Dual mode luminescence in rare earth (Er3+/Ho3+) doped ZnO nanoparticles fabricated by inclusive co precipitation technique

Das

Khichar

Chawla

2015

J Mater Sci: Mater Electron

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Dual excitation properties have been introduced in ZnO nanoparticles (*10 nm) through lanthanide (Er 3? /Ho 3? ) doping by inclusive co precipitation at room temperature. Monophasic hexagonal ZnO nanoparticles form hierarchical micro flowers as a consequence of lanthanide doping. The Stokes and anti Stokes emissions were investigated under UV (399 nm) and IR (980 nm) excitation. The down-conversion emission under band edge excitation is in the blue region and the up-conversion (UC) emission of lanthanide doped ZnO nanocrystals exhibit strong green and red fluorescence bands for ZnO:Er 3? and only green band for ZnO:Ho 3? . Post synthesis annealing further improves luminescence properties in ZnO:Er 3? that exhibits triple mode excitation of fluorescence under UV as well as IR wavelengths 980 and 1550 nm, also confirmed by confocal fluorescence mapping. The measured dependence of pump power on UC emission suggest that lanthanide doping in ZnO leads to frequency up-conversion emission via two to three photon absorption processes.

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“…5e, f) clearly show that the up-conversion photoluminescence occurs at both the wavelengths of excitation [30][31][32]. This happens due to direct excitation of Er 3?…”

Section: Triple Excitation Properties Of Zno:er 31mentioning

confidence: 81%

Dual mode luminescence in rare earth (Er3+/Ho3+) doped ZnO nanoparticles fabricated by inclusive co precipitation technique

Das

Khichar

Chawla

2015

J Mater Sci: Mater Electron

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“…6 Oxysulfides (Ln 2 O 2 S; Ln = La, Gd, Y) are considered as ideal host materials because of their low phonon energy, nontoxicity, and low symmetry, 7,8 among which Ln 2 O 2 S is considered to be one of the most effective for use in fluorescence applications. 4 Current applications of Ln 2 O 2 S phosphors include televisions, 9 catalysts, 10 upconversion lasers, 11 scintillation materials, 12 etc. Especially for application in display devices, smaller particles with high luminescence intensity are used to improve resolution.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Luminescence of La3+-Doped Gadolinium Oxysulfide with Tunable Crystalline Size

Ding

Wang

Zhang

et al. 2017

Journal of Elec Materi

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The concentration of La 3+ in (La x Gd 1Àx ) 2 O 2 S:Tb phosphors prepared by the sulfide fusion method from coprecipitated oxalate precursors has been tuned, and the prominent effect on the crystalline size, particle size, and luminescence properties investigated. First-principles calculations were used to characterize the charge deformation, energy gap, and crystal field. According to density functional theory, the electron density of states in conduction bands increased with increase in the La 3+ concentration. The increased electronic density strengthened the repulsion and thus decreased the diffusion so as to decrease the crystalline size from 106.2 nm to 37.3 nm. The particle size of (La x Gd 1Àx ) 2 O 2 S:Tb increased from 0.21 lm to 1.25 lm as the La 3+ concentration was increased from 15 mol.% to 60 mol.%. The excitation spectrum shifted towards shorter wavelength, enhancing the luminescence intensity of (La x Gd 1Àx ) 2 O 2 S:Tb when excited at 254 nm. Furthermore, shorter lifetime was obtained due to lower symmetry as more Gd 3+ was substituted by La 3+ ions.

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“…Thus, the materials can be used to increase the efficiency of Si solar cells by converting longer wavelength light to 1000 nm wavelength light that is suitable for absorption by Si [12,13]. Therefore, some work has been carried out to investigate the upconversion properties of Er 3 þ /Yb 3 þ -co-doped crystals especially the nanocrystals and ceramics under 1550 nm excitation [14,15].…”

Section: Introductionmentioning

confidence: 99%

NIR to visible upconversion in Er3+-doped fluoride glass under 1550 and 980nm excitations

Huang

Chen

2015

Ceramics International

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Intense visible and near infrared upconversion in M2O2S: Er (M=Y, Gd, La) phosphor under 1550nm excitation

Cited by 83 publications

References 9 publications

Dual mode luminescence in rare earth (Er3+/Ho3+) doped ZnO nanoparticles fabricated by inclusive co precipitation technique

Dual mode luminescence in rare earth (Er3+/Ho3+) doped ZnO nanoparticles fabricated by inclusive co precipitation technique

Enhanced Luminescence of La3+-Doped Gadolinium Oxysulfide with Tunable Crystalline Size

NIR to visible upconversion in Er3+-doped fluoride glass under 1550 and 980nm excitations

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