Upconversion luminescence and kinetics in Er3+:YAlO3 under 652.2nm excitation

Hu, Yang; Dai, Zhenwen; Sun, Zhiwei

doi:10.1016/j.jlumin.2006.02.021

Cited by 84 publications

(25 citation statements)

References 29 publications

(36 reference statements)

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“…Based on the energy level data as shown in Fig. 7 (Yang et al 2007). The solar light which contains continuous pump wavelengths was used as excitation source, thus the upconversion process may easily take place in Er 3?…”

Section: Mechanism Discussionmentioning

confidence: 99%

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Photocatalytic degradation of organic dyes by Er3+:YAlO3/TiO2 composite under solar light

et al. 2008

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In this work, Er 3? :YAlO 3 /TiO 2 composite was synthesized by a ultrasonic dispersion and liquid boil method. The Er 3? :YAlO 3 /TiO 2 composite and pure TiO 2 powder were characterized by XRD. The degradation of different organic dyes was used to evaluate the photocatalytic activity of the Er 3? :YAlO 3 /TiO 2 composite. It is found that the photocatalytic activity of Er 3? :YAlO 3 /TiO 2 composite is much higher than that for the similar system with only TiO 2 . Moreover, this Er 3? :YAlO 3 /TiO 2 composite provides a new way to take advantage of TiO 2 in sewage treatment aspects using solar light.

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Section: Mechanism Discussionmentioning

confidence: 99%

“…(Zu et al 2008;Xu and Jiang 2003;Yang et al 2007), the upconversion process can be achieved through the chains of ground state absorption (GSA) and excited state absorption (ESA). The emission bands around 318.7 and 320.1 nm were observed under the pumping of 486.5 and 542.4 (or 548.8) nm visible light(Zu et al 2008;Xu and Jiang 2003), respectively.…”

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confidence: 99%

Photocatalytic degradation of organic dyes by Er3+:YAlO3/TiO2 composite under solar light

et al. 2008

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“…Three emission bands centered at 410, 655, and 850 nm, respectively, are obtained under 532-nm excitation; these correspond to the transitions of Er 3+ : 2 G 9/2 → 4 I 15/2 , 4 F 9/2 → 4 I 15/2 , and 4 I 9/2 → 4 I 15/2 , respectively. The abundant upconversion emissions in the ultraviolet range are not obtained in this work [10,15,16] . Only the upconversion emission centered at 410 nm is observed, which may have resulted from a weak absorption at 532 nm in YA1O 3 : Er 3+[23] .…”

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confidence: 81%

“…Figure 3 shows the upconversion emission spectra of Y (0.95−x) AlO 3 : 5 mol% Er 3+ , x mol% Gd 3+ under excitations of (a) 980 and (b) 532 nm. Under the excitation of 980 nm, two strong emission bands approximately centered at 550 and 646 nm, respectively, are observed and can each be assigned to the [10,15,16] . Only the upconversion emission centered at 410 nm is observed, which may have resulted from a weak absorption at 532 nm in YA1O 3 : Er 3+ [23] .…”

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confidence: 98%

Enhancement of upconversion luminescence of YAlO3: Er3+ by Gd3+ doping

Li¹,

Bao-shu²,

Xing³

et al. 2012

中国光学快报

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The upconversion luminescences of YAlO3:Er 3+ phosphor co-doping with different Gd 3+ concentrations are investigated under the excitation of 980-and 532-nm diode lasers. A near ultraviolet upconversion emission at 410 nm is observed in YAlO3 under 532-nm excitation. Moreover, the inactive Gd 3+ ions can improve the upconversion intensity efficiently in a certain range of concentration. Under 980-nm excitation, the visible upconversion emissions at 546 and 646 nm are enhanced by about 10 and 8 times at the Gd 3+ concentration of 40%, respectively. The upconversion emission at 410 nm under 532-nm excitation is also enhanced by 7 times. The substitution of Gd 3+ ions for Y 3+ sites changes the local symmetry of Er 3+ , leading to the improvement of upconversion efficiency.OCIS codes: 160.5690, 160.4670, 160.4760. doi: 10.3788/COL201210.081602.In the last several decades, the upconversion luminescence of rare-earth-ion-doped materials has been investigated extensively due to their wide applications in solid-state lasers, flat panel displays, biological labeling, and so on [1−3] . Er 3+ has been reported as one of the most popular and efficient ions for upconversion [4−8] . It can provide several intermediate levels with long life time, which can be directly pumped by several diode lights [9−14] . Recently, upconversion phenomena in Er 3+ -doped YAlO 3 crystals have been widely studied because of their high mechanical hardness and considerable thermal conductivity, among others. Several authors have reported upconversion luminescence in Er 3+ -doped YAlO 3 under 518-, 542.4-, 548.9-, 652.2-, and 980-nm excitations [10,15−17] . Therefore, it is very important to improve their upconversion efficiency. There are many factors affecting the upconversion efficiency, such as the local environment, the dopant concentration, and the distribution of active ions in host materials [18] . A recent study has reported that the luminescence intensity can be enhanced by changing the local environment of luminescent centers, which can be performed by doping some suitable inactive ions in the host. , xGd 3+ (x=0, 0.15, 0.25, 0.4, 0.5, and 0.7) was prepared through a solution combustion synthesis procedure. An aqueous solution containing citric acid, Y(NO 3 ) 3 , Er(NO 3 ) 3 , and Gd(NO 3 ) 3 was used to synthesize the Er 3+ and Gd 3+ co-doped YAlO 3 powders. A citric acid-to-metal nitrate molar ratio of 1.5:1 was employed to prepare the precursor solution. After the combustion, the precursor was calcined at 1 100• C for 2 h. The powders were characterized by X-ray diffraction (XRD) on a Bruker D8 advanced equipment (x) using Cu tube with K α radiation of 0.15406 nm in the 2θ range of 20• -60• . The morphology of the prepared powders was observed by scanning electron microscopy (SEM) using JSM-6610. Upconversion luminescence spectra excited by 980-and 532-nm lasers were obtained in the spectrophotometer (R-500, Japan Spectroscopic Co., Japan). All the measurements were performed at room temperature. Figure 1 shows the representat...

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“…In fact, this possibility is not unrealistic considering that in other materials, the luminescence quantum efficiency of the 4 I 13/2 Er 3+ level approaches such theoretical 100 % limit [31][32][33][34][35][36][37]. The non-radiative component of the decay includes, in general, intrinsic multiphonon de-excitation of the 4 I 13/2 multiplet plus other extrinsic de-excitation channels, which include impurities quenching that is particularly relevant in nano-and submicrometer sized materials.…”

Section: 2-optical Characterizationmentioning

confidence: 99%

LaPO4:Er microspheres with high NIR luminescent quantum yield

García‐Sevillano

Cantelar

Justo

et al. 2013

Materials Chemistry and Physics

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Er-doped LaPO 4 micro-spheres have been synthesized by spray pyrolysis and the near infrared (NIR) properties have been characterized. It has been found that, following an adequate post-annealing treatment, the emission properties are remarkably improved. The NIR luminescence intensity is highly enhanced and its decay time increases to a value almost coincident with the reported radiative lifetime, which implies that the quantum yield approaches   100%. This improvement in luminescence characteristics is probably related to the suppression of residual OH -radicals, that otherwise act as NIR luminescence quenchers, and to the increase in material's crystallinity. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 2 *Manuscript Click here to view linked References 1.-INTRODUCTIONLanthanide phosphate (LaPO 4 ) and, in particular, its monoclinic polymorph (monazite), has been widely used as a host for the preparation of lanthanide-based phosphors. In fact, doped with Ce and Tb constitutes one of the classical phosphors used in high-quality fluorescent lighting due to its high quantum yield and stability at high temperature [1][2][3][4]. By varying the dopants (Pr, Nd, Eu, …) the optical properties can be tuned over a wide spectral range, with emerging applications in different fields such as biomedicine [5][6], photonic band gap materials or optical amplification [7][8]. In particular, for optical amplifiers and lasers, Er becomes the most interesting dopant because of its characteristic emission, at around 1.5 m, coincident with the transparency window of optical fibers [8][9]. Along this line, there has been a considerable effort along the last years in order to prepare Er doped phosphate particles incorporated into polymer-based components, in order to improve luminescence characteristics and trying to achieve long lifetimes and high quantum efficiencies [10][11][12][13][14][15][16][17]. The data reported in the literature for the 1.5 m emission lifetime vary within a very large range (60 s [14] to 3.7 ms [17]), reflecting possibly the large variety of dopants concentration, particle size and fabrication processes; affecting material's properties such as crystallinity or impurities content [10][11][12][13][14][15][16][17].Spray pyrolysis is a well known technique for the synthesis of powdered materials, whose main advantages are simplicity and continuous character, which, along with its suitability to control particle size (micrometric) and shape (spherical), make it very attractive for industrial purposes [18][19]. Recently, this method has been used to prepare LaPO 4 spheres doped with Ce and Tb ions, which showed a high luminescence efficiency after a post heating treatment at >1300ºC [20][21]. However, up to our knowledge, this synthesis method has never been applied to the synthesis of Er-doped LaPO ...

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Upconversion luminescence and kinetics in Er3+:YAlO3 under 652.2nm excitation

Cited by 84 publications

References 29 publications

Photocatalytic degradation of organic dyes by Er3+:YAlO3/TiO2 composite under solar light

Photocatalytic degradation of organic dyes by Er3+:YAlO3/TiO2 composite under solar light

Enhancement of upconversion luminescence of YAlO3: Er3+ by Gd3+ doping

LaPO4:Er microspheres with high NIR luminescent quantum yield

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