Donghua Chen
South Central University for Nationalities
Network
Latest external collaboration on country level. Dive into details by clicking on the dots.
Publication
Featured researches published by Donghua Chen.
Central European Journal of Physics | 2009
Shanshan Yao; Yuanyuan Li; Donghua Chen; Wanjun Tang; Yuhua Peng
In this study, the phosphors (Sr1−x, Znx)0.9(Al2−y, By)O4 doped 10 mol % Eu2+, were prepared by combustion method as the fluorescent material for white light emitting diodes (WLEDs), performing as a light source. The luminescent properties were investigated by changing the combustion temperature, the boron concentration, and the ratio of Sr to Zn. The luminescence, crystallinity and particle morphology were investigated by using a luminescence spectrometer, X-ray diffractometer (XRD) and transmission electron microscopy (TEM), respectively. The highest intensity of Sr0.9(Al2−y, By)O4: Eu0.12+ phosphor was achieved when the combustion temperature was 600° and the concentration of B3+ was 8 mol % of the aluminate. A new blue emission was observed when the high Zn concentration (x ⩾ 0.8), and this blue emission disappeared with the Zn concentration became lower than 0.8. The combustion method synthesized phosphor (Sr0.6, Zn0.4)0.9(Al1.92, B0.08)O4: Eu0.12+ showed 3.3 times improved emission intensity compared with that of the Sr0.9(Al1.92, B0.08)O4:Eu0.12+ phosphor under λex = 390 nm.
Luminescence | 2011
Qiuxia Li; Jiaping Huang; Donghua Chen
The novel red-emitting phosphors K(x)Sr(1-2x)MoO₄:Pr³⁺(x) (0.00 ≤ x ≤ 0.04) were prepared by solid-state reaction. The crystallization and particle sizes of samples were investigated by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM images were in good agreement with the theoretical calculation data from the XRD patterns. Photoluminescence analysis indicated that there were three excitation peaks under 430-500 nm, and all samples showed the intensely red emission at 648 nm corresponding to the ³P₀ → ³F₂ transition of Pr³⁺. The concentrations of doping ions, temperature and polyethylene glycol in the phosphor system can significantly influence the intensity of the red emission. The photoluminescence spectral intensity reached its maximum at x = 0.02. The results showed that the investigated phosphor is a potential red phosphor for white light-emitting diodes.
Central European Journal of Physics | 2010
Qiong Wei; Donghua Chen
SrMoO4:Eu3+ red phosphors were prepared by combining sol-gel and solid-state route. Citric acid and ethylenediaminetetraacetic acid (EDTA), employed as the chelating agents, were added to the aqueous solutions of metal nitrates. X-ray diffraction (XRD) and photoluminescent spectra techniques (PL) were used to characterize the resultant powders. The results indicated the obtained SrMoO4:Eu3+ phosphors were fine powders with a particle size of 50 nm. The effects of synthesizing conditions were also investigated and optimized, which included the synthesis temperature and the activator concentration on the luminescent intensity. Compared with SrMoO4:Eu3+ phosphors prepared by Solid-state reaction SrMoO4:Eu3+ phosphors prepared by combining sol-gel and solid-state route showed appropriate particle size and a higher emission intensity.
Journal of Alloys and Compounds | 2011
Qiuxia Li; Jiaping Huang; Donghua Chen
Materials Science and Engineering B-advanced Functional Solid-state Materials | 2010
Jiaping Huang; Qiuxia Li; Donghua Chen
Journal of Materials Science | 2007
Shengyu Yin; Donghua Chen; Wanjun Tang; Yuhong Yuan
Materials Science and Engineering B-advanced Functional Solid-state Materials | 2007
Shengyu Yin; Donghua Chen; Wanjun Tang; Yuhua Peng
Materials Letters | 2010
Jiaping Huang; Qiuxia Li; Donghua Chen
Journal of Applied Polymer Science | 2000
Donghua Chen; Yuhong Yuan; Qizhi Zhao; Lihua Wang; Laoli Wang
Journal of Applied Polymer Science | 2006
Lihua Wang; Qingyu Xu; Donghua Chen; Yuhong Yuan; Wanjun Tang; Laoli Wang