Spectroscopic and lasing studies of Ce3+:Er3+:Yb3+:YVO4 crystals

Tsang, Yuen Hong; Binks, David J.; Richards, Billy; Jha, A.

doi:10.1002/lapl.201110056

Cited by 20 publications

(15 citation statements)

References 39 publications

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“…There are claims that the energy transfer is enhanced improving laser action from the Er 3 þ 4 I 13/2 state [21]. Others claim that there are quenching [22] and back-transfer from Yb 3 þ -Er 3 þ [23].…”

Section: Resultsmentioning

confidence: 99%

“…The activators were added as nitrates, Ce(NO 3 The films were examined by scanning electron microscopy (SEM model FEI with Bruker EDX attachment). To avoid charge problems in the SEM, all the samples were coated with a thin layer of platinum.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Complete replacement by rare earths requires cation vacancies to maintain charge balance. In the silicate apatites, the 4f sites have 9-fold coordination while the 6h sites have 7-fold coordination so that the formula may be written Ln 3 …”

Section: Phosphor Host Structurementioning

confidence: 99%

“…The incorporation of a single rare-earth activator including Er 3 þ , Ce 3 þ , Tb 3 þ , or Eu 3 þ in silicon or silicate complexes has recently received wide attention [1][2][3][4]. Nevertheless, preparing single phase RE-silicate complexes with high photoluminescence (PL) efficiency remains difficult.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Infrared photoluminescence of sol–gel spin-coated films of rare-earth activated lanthanum silicate

Juwhari¹,

Kailani²,

Lahlouh³

et al. 2012

Materials Letters

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Section: Resultsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Phosphor Host Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Infrared photoluminescence of sol–gel spin-coated films of rare-earth activated lanthanum silicate

Juwhari¹,

Kailani²,

Lahlouh³

et al. 2012

Materials Letters

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“…There is a small energy mismatch between the Er 3+ : 4 I 11/2 -4 I 13/2 and Ce 3+ : 2 F 7/2 -2 F 5/2 energy gaps; the addition of Ce 3+ would make more Er 3+ ions in 4 I 11/2 rapidly decay to the next lower level 4 I 13/2 through the cross relaxation (CR) process [Er 3+ : 4 I 11/2 , Ce 3+ : 2 F 5/2 ] → [Er 3+ : 4 I 13/2 , Ce 3+ : 2 F 7/2 ], and lead to a suppress of the excited state absorption (ESA) and cooperative upconversion (CUC) processes which occur in Er 3+ : 4 I 11/2 ; the both would further cause a population of Er 3+ : 4 F 7/2 and result in green upconversion fluorescence [14]. We have observed the Ce 3+ -induced enhancement of Er 3+ 1.5 μm emissions in glass fibers and crystal [15,16]. The Ho 3+ : 5 I 6 -5 I 7 shows a similar energy gap as the Er 3+ : 4 I 11/2 -4 I 13/2 , and the ESA and CUC are also the leading processes responsible for the visible upconverted emissions that occurred in Yb 3+ /Ho 3+ codoping scheme under 980 nm excitation [12,13], in which some of Ho 3+ ions in 5 I 6 were excited to higher manifolds ( 5 S 2 + 5 F 4 ) resulting in a depopulation of the Ho 3+ : 5 I 6 .…”

Section: Introductionmentioning

confidence: 94%

Enhanced 2.0μm emission and energy transfer in Yb3+/Ho3+/Ce3+ triply doped tellurite glass

Tao

Tsang

Zhou

et al. 2012

Journal of Non-Crystalline Solids

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Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

Bai

Tsang

Hao

2014

Advanced Optical Materials

134

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thermoluminescence (TL), and so on. [ 2 ] Nowadays, a large number of phosphors have been synthesized and developed, each one having its own characteristic emission wavelength, bandwidth, and luminescence lifetime. Here, the lifetime normally means the time in which the emission intensity decays to 1/ e . Moreover, phosphors have been extensively utilized in many areas, both scientifi c research and practical applications. For instance, phosphor-converted fl uorescent lamps and white light-emitting devices (LEDs) have been used as light sources in a widespread range of daily life and industrial applications. [ 3 ] CL and EL phosphors have been applied to traditional or modern display devices presenting visual information. [ 4 ] In the past few decades, fl uorescent nanoparticles, such as quantum dots (QDs) [ 5 ] and lanthanide (Ln) ion-doped nanocrystals, [ 6 ] have attracted considerable attention and showed great promise in fl uorescent probes, biosensing, bioimaging, therapies, and optoelectronic devices. [ 7 ] The ability to tune the luminescence properties of phosphors is highly desired in the optical materials community. [ 8 ] For various applications such as solid-state lasers, bioimaging, optical sensing, and display devices, precise control over the luminescence properties is essential for optimizing the performance and processing of optical devices and systems. Tuning luminescence is also of great signifi cance for fundamental studies of the luminescence mechanisms of phosphors. In general, tuning luminescence in the visible region is popularly known as varying the emission colour and brightness obtained by the naked eye. Broadly speaking, tuning luminescence changes the emission intensity, wavelength, bandwidth, luminescence decay or lifetime, and polarization.Numerous studies have extensively focused on tuning the luminescence of phosphors by conventional chemical ways, typically changing chemical compositions, crystal structure, phase, nanocrystal size, surface groups, and so on. [ 9 ] Comparatively, there have been less results that show the tunable luminescence of phosphors through physical methods. So far, few attempts have been made to provide a comprehensive coverage of the strategies pertaining to this emerging research fi eld and a broad overview of research advances in diverse areas of application. In this review, chemically driven luminescence tuning is Tuning the luminescence of phosphors is extremely important in controlling and processing light for active components of light sources, optical sensing, display devices, and biomedicine. So far, conventional chemical approaches have routinely been employed to modify the luminescence during the phosphor's synthesis. It is interesting to broaden the modulation of luminescence by physical methods, such as electric fi eld, magnetic fi eld, mechanical stress, temperature, photons, ionizing radiation, and so on. Since some physical methods may provide unusual routes to tune the luminescence in in-situ, real-time, dynamical and reversible mann...

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Spectroscopic and lasing studies of Ce3+:Er3+:Yb3+:YVO4 crystals

Abstract: Abstract:Absorption and fluorescence spectra and fluorescence lifetime measurements are presented for Total output pulses energy as a function of absorbed pump energy for QCW operation

Cited by 20 publications

References 39 publications

Infrared photoluminescence of sol–gel spin-coated films of rare-earth activated lanthanum silicate

Infrared photoluminescence of sol–gel spin-coated films of rare-earth activated lanthanum silicate

Enhanced 2.0μm emission and energy transfer in Yb3+/Ho3+/Ce3+ triply doped tellurite glass

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

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