Combustion synthesis and luminescent properties of red-emitting Ca4−xAl6WO16:xEu3+ phosphors and photoluminescence enhancement by Bi3+ co-doping

Hong, Fei; Zhou, Liqun; Li, Ling; Xia, Qinghua; Luo, Xinru

doi:10.1016/j.optcom.2013.11.049

Cited by 13 publications

(5 citation statements)

References 28 publications

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“…41)] with lattice parameter values are a ¼ 26.15 Å, b ¼ 13.07 Å and c ¼ 9.319 Å and a ¼ b ¼ g ¼ 90 . However, Hong et al 19 reports the formation of tetragonal phase with space group P 4c2 (no. 116) which is in contradiction to the present observation.…”

Section: Resultsmentioning

confidence: 99%

“…However, Liu et al 18 has presented interesting luminescence properties of Ca 8 [Al 12 -O 24 ](WO 4 ) 2 :Tb 3+ phosphor synthesized by solid state reaction method. Hong et al 19 has reported interesting luminescence properties of novel Eu 3+ activated alumino-tungstate (Ca 4 Al 6 -WO 16 ) phosphors synthesized by combustion method, and found to be potential candidate for near-UV LEDs. Varieties of methods are available for the synthesis of the tungstate based phosphors, but in this work, we utilized citrate complexation and combustion methods for the synthesis of rare earth (Eu 3+ , Dy 3+ and Sm 3+ ) activated Ca 4 Al 6 WO 16 phosphors and their photoluminescence (PL) properties were studied.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and assessment of photoluminescent properties of Ca_4−2xAl₆WO₁₆:RE_x,Na_x (RE = Eu³⁺, Dy³⁺ and Sm³⁺) phosphors

Dabre¹,

Dhoble

2015

RSC Adv.

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In the present work, rare earth (Eu 3+ , Dy 3+ and Sm 3+ ) activated Ca 4 Al 6 WO 16 phosphors were synthesized by citrate complexation and combustion methods and their photoluminescence characterization was performed. The phase purity and morphology of the phosphors were characterized by XRD and SEM.The SEM micrographs of phosphor sample synthesized by citrate complexation method show a layer structure while sample synthesized by citrate combustion method show porous nature. Intense red emission of Eu 3+ and yellow emission of Dy 3+ in Ca 4 Al 6 WO 16 host lattice show the occupation of a noncentrosymmetric site by the rare earth ions in the host lattice. The reddish orange emission from Sm 3+ activated phosphor consists of three intense emission peaks in yellow, orange-red and red regions, respectively at 567, 604 and 650 nm. Intense characteristic emissions show no concentration quenching up to 2 mol% concentration of rare earth ions. The phosphors could be effectively excited by near UV (Dy 3+ activated phosphor) and visible light (Eu 3+ and Sm 3+ activated phosphors) and give emission hues from orange-red to near white, demonstrating their potential suitability for application in solid state lighting. Material and methodsCalcium nitrate [Ca(NO 3 ) 2 $4H 2 O], aluminum nitrate [Al(NO 3 ) 2 $9H 2 O], tungstic acid (H 2 WO 4 ), sodium tungstate (Na 2 WO 4 ), citric acid (C 6 H 8 O 7 $H 2 O), ethylene glycol (C 2 H 6 O 2 ), 25% ammonia (NH 3 ) solution and 69-71% nitric acid (HNO 3 ) were analytically pure (99.9%) and used without further purication for the synthesis of Ca 4 Al 6 WO 16 . For the rare earth (Eu 3+ , Dy 3+ and Sm 3+ ) doping the analytically pure (99.99%) rare earth oxides [RE 2 O 3 (RE ¼ Eu, Dy and Sm)] were used. The details of methods of synthesis employed in this work viz. citrate complexation and citrate combustion methods are given as follows.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and assessment of photoluminescent properties of Ca_4−2xAl₆WO₁₆:RE_x,Na_x (RE = Eu³⁺, Dy³⁺ and Sm³⁺) phosphors

Dabre¹,

Dhoble

2015

RSC Adv.

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“…Both the shape and peak positions have no palpable changes even though the concentration of Eu 3+ varies, but the PL intensity changes with increasing Eu 3+ concentration. A weak luminescence occurs when a small number of Eu 3+ is doped in the phosphors, whereas a large number of Eu 3+ lead to the concentration quenching of the luminescence [21]. The inset in Fig.…”

Section: Pl Propertiesmentioning

confidence: 98%

Photoluminescence properties and energy transfer of Eu3+,Bi3+ co-doped Ca9Y(PO4)7 phosphors

Guan

Chen

et al. 2015

J. Display Technol.

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Abstract：Bi 3+ and Eu 3+ ions co-activated Ca 9 Y(PO 4 ) 7 phosphors were prepared by solid-state reaction. The crystal structure, luminescence properties, and morphology of these phosphors were studied. X-ray diffraction results showed that when the calcination temperature was 1100 °C, the phosphates could obtain their own pure phase. Scanning electron microscopy images exhibited that the average particle diameter of the phosphors was approximately 5-8 μm. The phosphors could be excited by near-UV light at 397 nm, which agrees with the current UV chip, and with red light emission at 617 nm. The co-doped Bi 3+ ions demonstrated efficient energy transfer to Eu 3+ ions, and the emission intensity of Bi 3+ and Eu 3+ co-doped samples were approximately two times as high as that of Eu 3+ singly doped samples. The CIE value (0.64, 0.34) of Ca 9 Y 0.92 (PO 4 ) 7 :Bi 3+ 0.01 , Eu 3+ 0.07 was close to the standard red color coordinates. All results indicated that the red phosphors could be potentially applied to white light-emitting diodes.

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“…[22][23][24] Basically, luminescence properties of phosphors depend on the type of activators and host composition; a homogeneous distribution of activator ions throughout the host material is needed to obtain high luminescence for advanced display devices. 25 To prepare phosphor powders satisfying the requirements listed above, a number of synthetic approaches such as sol-gel, [26][27][28] combustion, 29,30 polymer precursor, 31 glycothermal, 32 spray pyrolysis, [33][34][35][36] spray drying, 37,38 and hydrothermal methods 39,40 have been investigated. As a result, the powders produced have a wide variety of morphologies, including filled sphere, hollow sphere, nanorod, nanowire, nanoplate, core-shell, tube, and fiber structures.…”

Section: Introductionmentioning

confidence: 99%

Yolk–shell structured Gd₂O₃:Eu³⁺ phosphor prepared by spray pyrolysis: the effect of preparation conditions on microstructure and luminescence properties

Cho

Jung

2015

Phys. Chem. Chem. Phys.

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Gd2O3:Eu(3+) yolk-shell phosphor powders with high photoluminescence intensity were prepared by spray pyrolysis. Preparation temperature and spray solution concentration were varied to find the optimum process conditions for preparation of Gd2O3:Eu(3+) with yolk-shell structure. The formation mechanism of yolk-shell Gd2O3:Eu(3+) was systematically investigated by observing the microstructures of particles produced under various preparation conditions. The morphological structure of Gd2O3:Eu(3+) powders was clearly dependent on reactor temperature and on the precursor solution concentration. Eventually, pure yolk-shell structured Gd2O3:Eu(3+) powders were obtained for a reaction temperature of 1000 °C and concentration of the spray solution below 0.2 M. Also, the yolk-shell structure formed showed high thermal stability, making it possible to maintain the original spherical yolk-shell structure through calcination at high temperatures. As a result, highly crystalline Gd2O3:Eu(3+) phosphor powders having yolk-shell structure and an agglomeration-free spherical shape were successfully synthesized by spray pyrolysis. These phosphor powders were shown to have good photoluminescence characteristics.

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Combustion synthesis and luminescent properties of red-emitting Ca4−xAl6WO16:xEu3+ phosphors and photoluminescence enhancement by Bi3+ co-doping

Cited by 13 publications

References 28 publications

Synthesis and assessment of photoluminescent properties of Ca_4−2xAl₆WO₁₆:RE_x,Na_x (RE = Eu³⁺, Dy³⁺ and Sm³⁺) phosphors

Synthesis and assessment of photoluminescent properties of Ca_4−2xAl₆WO₁₆:RE_x,Na_x (RE = Eu³⁺, Dy³⁺ and Sm³⁺) phosphors

Photoluminescence properties and energy transfer of Eu3+,Bi3+ co-doped Ca9Y(PO4)7 phosphors

Yolk–shell structured Gd₂O₃:Eu³⁺ phosphor prepared by spray pyrolysis: the effect of preparation conditions on microstructure and luminescence properties

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Combustion synthesis and luminescent properties of red-emitting Ca4−xAl6WO16:xEu3+ phosphors and photoluminescence enhancement by Bi3+ co-doping

Cited by 13 publications

References 28 publications

Synthesis and assessment of photoluminescent properties of Ca4−2xAl6WO16:REx,Nax (RE = Eu3+, Dy3+ and Sm3+) phosphors

Synthesis and assessment of photoluminescent properties of Ca4−2xAl6WO16:REx,Nax (RE = Eu3+, Dy3+ and Sm3+) phosphors

Photoluminescence properties and energy transfer of Eu3+,Bi3+ co-doped Ca9Y(PO4)7 phosphors

Yolk–shell structured Gd2O3:Eu3+ phosphor prepared by spray pyrolysis: the effect of preparation conditions on microstructure and luminescence properties

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Synthesis and assessment of photoluminescent properties of Ca_4−2xAl₆WO₁₆:RE_x,Na_x (RE = Eu³⁺, Dy³⁺ and Sm³⁺) phosphors

Synthesis and assessment of photoluminescent properties of Ca_4−2xAl₆WO₁₆:RE_x,Na_x (RE = Eu³⁺, Dy³⁺ and Sm³⁺) phosphors

Yolk–shell structured Gd₂O₃:Eu³⁺ phosphor prepared by spray pyrolysis: the effect of preparation conditions on microstructure and luminescence properties