Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology

Changzhou, China

Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology

Changzhou, China
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He X.,Jiangsu Teachers University of Technology | He X.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | Guan M.,Jiangsu Teachers University of Technology | Guan M.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | And 8 more authors.
Journal of the American Ceramic Society | Year: 2011

Novel Li+- and Na+-doped BaMoO4:Pr 3+ deep-red-emitting phosphors were synthesized using a solid-state reaction. The effects of codoping of Li+ and Na+ ions on the structure, morphology, and luminescent properties of BaMoO 4:Pr3+ were investigated by X-ray diffraction, scanning electron microscopy, UV-Vis diffuse reflectivity, and photoluminescence spectra. The phosphors retained the scheelite-type tetragonal structure, regardless of codoping Li+ or Na+. Under excitation of blue light, these phosphors showed a dominant deep-red emission that peaked at 643 nm corresponding to 3P0→3F2 transition of Pr3+ ions. The luminescence of BaMoO 4:Pr3+ was remarkably enhanced by the incorporation of superfluous Li+ or Na+, which results not only from the improvement of surface and size distribution of particles but also from the sensitization of oxygen vacancies. The luminescence intensities of BaMoO 4:0.01Pr3+, 0.05Li+ and BaMoO 4:0.01Pr3+, 0.10Na+ are about 1.9 and 1.7 times higher than that of the commercial phosphor CaS:Eu2+, respectively. © 2011 The American Ceramic Society.


He X.,Jiangsu Teachers University of Technology | He X.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | Guan M.,Jiangsu Teachers University of Technology | Guan M.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | And 6 more authors.
Journal of Alloys and Compounds | Year: 2010

K2Bi(PO4)(MO4):Eu3+(M = Mo,W) red-emitting phosphors were synthesized by solid state reaction and characterized by powder X-ray diffraction (XRD), Fourier transform infrared (FT-IR) and photoluminescence (PL) spectrum. XRD and FT-IR analysis confirmed the formation of K2Bi(PO4)(MO4):Eu3+(M = Mo,W) pure phase. Photoluminescence results showed that the series phosphors can be excited efficiently by either UV light range from 200 to 300 nm or near-UV between 375 and 410 nm, and then exhibited bright pure red emission. The concentration quenching occurs at a relatively higher concentration of europium activator, which resulted from the special structure of host lattice and efficient energy transfer within the nearest-neighbor Eu3+ ions. An enhancement of Eu3+ luminescence is observed when W6+ replaces into Mo6+ in this phosphor, which might be attributed to the changing of crystal field environment of Eu3+ resulting from the forming solid solution of host by introducing WO4. The composition-optimized phosphor, K2Bi(PO4)(WO4):0.80Eu3+ presents the best luminescence performance, which can be used as a potential candidate for the phosphor-converted white LEDs. © 2009 Elsevier B.V. All rights reserved.


Bi C.-L.,Jiangsu Teachers University of Technology | Bi C.-L.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | Sun J.-H.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology
Jiegou Huaxue | Year: 2011

A new two-dimensional (2D) manganese(II) coordination polymer {[Mn(bidc)(H2O)2]· 2H2O}n (H2bidc = benzimidazole-5,6-dicarboxylic acid) was synthesized, and characterized by X-ray crystallography and other measurements. The complex crystallizes in the orthorhombic system, space group Pbca with a = 7.0218(7), b = 17.9701(18), c = 19.0697(19) Å, V = 2406.3(4) Å3, Z = 8, Dc = 1.823 g/cm3, Mr = 330.14, F(000) = 1344, μ(MoKα) = 1.140 mm-1, S = 1.055, R = 0.0305 and wR = 0.1012 for 2130 observed reflections (I > 2s(I)). The title complex consists of a novel 2D network with a topology of short symbol (4.82)(4.8 2).


He X.,Jiangsu Teachers University of Technology | He X.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | Zhou J.,Jiangsu Teachers University of Technology | Zhou J.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | And 6 more authors.
Journal of Luminescence | Year: 2010

Sm3+-activated gadolinium molybdate, Gd2(MoO4)3:Sm3+ red-emitting phosphor was prepared by conventional solid-state method. The structure, morphology, and luminescent properties of these powder samples have been investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and fluorescent spectrophotometry, respectively. The as-obtained phosphor has a monoclinic structure with single crystalline phase. Its mean particle size is about 6-8 μm with pseudo-pompon shape and large surface area, which is suitable for manufacture of white LEDs. The phosphor can be efficiently excited by incident light of 348-445 nm, well matched with the output wavelength of a near-UV InGaN-based chip, and re-emits an intense red light peaking at 650 nm. By combing this phosphor with a 405 nm-emitting InGaN chip, a red LED was fabricated, so that the applicability of this novel phosphor to white LEDs was confirmed. It is considered to be an efficient red-emitting conversion phosphor for solid-state lighting based on InGaN LEDs. © 2009 Elsevier B.V. All rights reserved.


He X.,Jiangsu Teachers University of Technology | He X.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | Guan M.,Jiangsu Teachers University of Technology | Guan M.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | And 8 more authors.
Journal of Rare Earths | Year: 2010

Eu3+-activated Gd2(MoO4)3 pseudo-pompon-like red-emitting phosphors were prepared by solid-state method. The structure, morphology, and luminescent properties of these powder samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and fluorescent spectrophotometry, respectively. The as-obtained phosphors were single crystalline phase with orthorhombic unit cell. The particles of the powder samples had the length of 5-12 ?m and width of 3-7 ?m with flake shape and large surface area, which is suitable for manufacture of white LEDs. The phosphor could be efficiently excited by the incident light of 348-425 nm, well matched with the output wavelength of near-UV (In, Ga)N chip, and re-emitted an intense red light peaking at 615 nm. By combing this phosphor with a ∼395 nm-emitting (In, Ga)N chip, a red LED was fabricated, so that the applicability of this novel phosphor to white LEDs was confirmed. It is considered to be an efficient red-emitting conversion phosphor for solid-state lighting based on (In, Ga)N LEDs. © 2010 The Chinese Society of Rare Earths.


Zhuang Y.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | Zheng J.,Suzhou University | Huang H.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology | Zhou Q.,Jiangsu Province Key Laboratory of Precious Metal Chemistry and Technology
Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | Year: 2011

Ag nanoparticles were employed as catalyst and their effect on the reaction rate of the nitro-compound were investigated. Results show that Ag nanoparticles can greatly accelerate the reduction of nitro-compound at room temperature, and the nitro-compound with positive charges has higher catalytic reaction rate than that with negative charges. More Ag nanoparticles lead to higher reaction rate; however, the amount should be limited due to the properties of the nanoparticles. The bigger the Ag nanoparticle size is, the higher the reaction rate is. Copyright © 2011, Northwest Institute for Nonferrous Metal Research.

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