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Sun Q.,Qingdao Agricultural University | Wang J.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | Shi J.,Qingdao Agricultural University
Journal of Solid State Chemistry | Year: 2010

The environmental factor he of the host was calculated quantitatively in Pb2+-doped 23 compounds based on the dielectric theory of chemical bond for complex crystals. The relationship between the A band energy EA of Pb2+ and the environmental factor he was intensively studied. The results indicate that EA of Pb2+ decreases linearly with increasing of he. A linear model was proposed which allows us to correctly predict and assign the site occupations and the position of A band for Pb2+-doped compounds if the crystal structure and the refraction index were known. Applied to SrGa2O4:Pb2+, CaAl2B2O7:Pb2+ and SrAl2B2O7:Pb2+, the theoretical predictions are in very good agreement with the experimental data. In SrGa2O4:Pb2+, the excitation spectrum of Pb2+ from two different cation sites was identified: the higher energy band of A (265 nm) from the site of Sr2, and the lower ones (280 nm) from the site of Sr1. © 2010 Elsevier Inc. All rights reserved. Source


Zhang Q.,General Research Institute for Nonferrous Metals, China | Zhang Q.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | Wang J.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | Ni H.,General Research Institute for Nonferrous Metals, China | Wang L.,General Research Institute for Nonferrous Metals, China
Rare Metals | Year: 2012

The new phosphors Bi 2ZnB 2O 7: Ln 3+ (Ln 3+ = Eu 3+, Dy 3+) were synthesized by solid-state reaction technique. The obtained phosphors were investigated by means of X-ray powder diffraction (XRD), photoluminescence excitation and emission spectra with the aim of enhancing the fundamental knowledge about the luminescent properties of Eu 3+ and Dy 3+ ions in the Bi2ZnB2O7 host lattice. XRD analysis shows that all these compounds are of a single phase of Bi 2ZnB 2O 7. The excitation and emission spectra of Bi 2ZnB 2O 7: Ln 3+ (Ln 3+ = Eu 3+, Dy 3+) at room temperature show the typical 4f-4f transitions of Eu 3+ and Dy 3+, respectively. The hypersensitive transitions of 5D 0→ 7F 2 (Eu 3+) and 4F 9/2→ 6H 13/2 (Dy 3+) are relatively higher than those of the insensitive transitions in Bi 2ZnB 2O 7. It is conceivable that the Bi 2ZnB 2O 7 structure provides asymmetry sites for activators (Eu 3+, Dy 3+). The optimum concentrations of Eu 3+ and Dy 3+ ions in Bi 2ZnB 2O 7 phosphors are both x = 0.05. © The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2012. Source


Zhang X.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | Wang J.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | Huang L.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | Pan F.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | And 4 more authors.
ACS Applied Materials and Interfaces | Year: 2015

The design of luminescent materials with widely and continuously tunable excitation and emission is still a challenge in the field of advanced optical applications. In this paper, we reported a Eu2+-doped SiO2-Li2O-SrO-Al2O3-K2O-P2O5 (abbreviated as SLSAKP:Eu2+) silicate luminescent glass. Interestingly, it can give an intense tunable emission from cyan (474 nm) to yellowish-green (538 nm) simply by changing excitation wavelength and adjusting the concentration of Eu2+ ions. The absorption spectra, photoluminescence excitation (PLE) and emission (PL) spectra, and decay curves reveal that there are rich and distinguishable local cation sites in SLSAKP glasses and that Eu2+ ions show preferable site distribution at different concentrations, which offer the possibility to engineer the local site environment available for Eu2+ ions. Luminescent glasses based color and white LED devices were successfully fabricated by combining the as-synthesized glass and a 385 nm n-UV LED or 450 nm blue LED chip, which demonstrates the potential application of the site engineering of luminescent glasses in advanced solid-state lighting in the future. © 2015 American Chemical Society. Source


Chen Y.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | Wang J.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | Zhang X.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | Zhang G.,Ministry of Education Key Laboratory of Bioinorganic and Synthetic Chemistry | And 2 more authors.
Sensors and Actuators, B: Chemical | Year: 2010

An intense green phosphor, LiSrPO4:Eu2+, Tb3+, was synthesized by high temperature solid-state reaction. The photoluminescence excitation and emission spectra, the lifetime and concentration effect are investigated in detail. The results show that an efficient non-radiative energy transfer from Eu2+ to Tb3+ occurs and its efficiency is about 66.4%. Tb3+ ions give an intense green emitting light by a strong excitation band of Eu2+ ions at 280-410 nm, matching well with the dominant emission band of (n)-UV (350-420 nm) LEDs. A phosphor-converted green LED was fabricated by coating the LiSrPO4:Eu2+, Tb3+ phosphor onto (n)-UV chip emitting at 370 nm. These results demonstrate that Tb3+ ion with low 4f-4f absorption efficiency in (n)-UV region can play a role of activator in narrow green-emitting phosphor potentially useful in (n)-UV GaN-based LED through efficient energy feeding by allowed 4f-5d absorption of Eu2+ with high oscillator strength. © 2010 Elsevier B.V. All rights reserved. Source

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