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Search Results: 1 - 10 of 137466 matches for " LI Pan-Lai "
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Luminescence Characteristics of Dy3+ Activated LiCaBO3 Phosphor
WANG Zhi-Jun,LI Pan-Lai,YANG Zhi-Ping,GUO Qing-Lin
无机材料学报 , 2009, DOI: 10.3724/sp.j.1077.2009.01069
Abstract: LiCaBO3 y3+ phosphor was synthesized by solid-state method. LiCaBO3 y3+ phosphor shows several bands peaking at 484, 577 and 668nm. Monitoring at 577nm peak, the excitation spectrum has several bands peaking at 331, 368, 397, 433, 462 and 478nm. The emission spectrum and luminescence intensity of LiCaBO3 y3+ phosphor were investigated by varying Dy3+ concentration. The result shows that the ratio (Y/B) of yellow emission (577nm) to blue emission (484nm) increases with increasing Dy3+ concentration. Moreover, the luminescence intensity firstly increases and then decreases with increasing Dy3+ concentration, and reaches the maximum at 3.00mol% Dy3+. And the concentration quenching mechanism is the d-d interaction by Dexter theory. The emission intensity of LiCaBO3 y3+ phosphor is enhanced with doping Li+, Na+ or K+. The InGaNa2based LiCaBO3 y3+ shows a nice white-emitting, and the CIE chromaticity is (x=0.3001, y=0.3152).
Preparation and Luminescent Characteristics ofKBaPO4,Tb3+ Phosphor
WANG Zhi-Jun, LI Pan-Lai, YANG Zhi-Ping, GUO Qing-Lin
无机材料学报 , 2011, DOI: 10.3724/sp.j.1077.2011.00503
Abstract: A green phosphor, KBaPO4:Tb3+, was synthesized by the high temperature solid―state method, using Li2CO3, Na2CO3, K2CO3, BaCO3, NH4H2PO4, NH4Cl, Tb4O7 and CeO2 as starting materials. After these individual materials were blended and grounded thoroughly in an agate mortar, the homogeneous mixture was heat―treated at 950 for 3 h, and the phosphors were obtained. The samples was characterized by powder X―ray diffraction (XRD) (D/max―rA, Cu Ka, 40 kV, 40 mA, λ=0.15406 nm). The spectral characteristics of these phosphors were measured by a SHIMADZU RF―540 fluorescence spectrophotometer. KBaPO4:Tb3+ phosphor shows several emission peaks located at 437, 490, 545, 586 and 622 nm which correspond to the 5D3→7F4 and 5D4→7FJ=6. 5, 4, 3 transition of Tb3+, respectively, and the highest emission peak is 545 nm. Monitored at 545 nm emission, the excitation spectrum consists of several bands, and the highest peak locates at 380 nm. The effects of Tb3+ doping content, the compensators (Li+, Na+, K+ or Cl―), and the sensitize activator Ce3+ on the emission intensity of KBaPO4: Tb3+ phosphor are studied. The results show that the emission intensity can be controlled by the above factors, and the intensity can be enhanced by the selection of the optimal condition. It indicates that KBaPO4:Tb3+ is a promising green phosphor for white light emitting diodes.
A novel yellow phosphor for white light emitting diodes

Wang Zhi-Jun,Li Pan-Lai,Yang Zhi-Ping,Guo Qing-Lin,Li Xu,

中国物理 B , 2010,
Abstract: This paper reports that a novel yellow phosphor, LiSrBO3:Eusup>2+, was synthesized by the solid-state reaction. The excitation and emission spectra indicate that this phosphor can be effectively excited by ultraviolet (360 and 400~nm) and blue (425 and 460~nm) light, and exhibits a satisfactory yellow performance (565~nm). The role of concentration of Eusup>2+ on the emission intensity in LiSrBO3 is studied, and it is found that the critical concentration is 3 mol\%, and the concentration self-quenching mechanism is the dipole--dipole interaction according to the Dexter theory. White light emitting diodes were generated by using an InGaN chip (460~nm or 400~nm) with LiSrBO3:Eusup>2+ phosphor, the CIE chromaticity is (x=0.341, y=0.321) and (x=0.324, y=0.318), respectively. Therefore, LiSrBO3:Eusup>2+ is a promising yellow phosphor for white light emitting diodes.
Luminescence and Crystallographic Sites of Eu2+ in KNaCa2(PO4)2
WANG Zhi-Jun, LI Yan, WANG Ying, LI Pan-Lai, GUO Qing-Lin, YANG Zhi-Ping
无机材料学报 , 2011, DOI: 10.3724/sp.j.1077.2011.00731
Abstract: A blue phosphor, KNaCa2(PO4)2:Eu2+, was prepared by the high temperature solid―state method, and its luminescent characteristics were investigated. The spectral characteristics show that it can be effectively excited by near ultraviolet light (400 nm), and exhibits blue light (470 nm). The crystallographic sites of Eu2+ in KNaCa2(PO4)2 are calculated by van Uitert formula. In KNaCa2(PO4)2:Eu2+, the emission band centered at 461 nm originates from the Eu2+ center of the eight compounds, and the emission band centered at 502 nm originates from the Eu2+ center of the six compounds. The influence of Eu2+ concentration on the emission intensity of the phosphor is investigated. The result shows that the emission intensities firstly increase with the increase in Eu2+ concentration, reach a maximum at 1mol% Eu2+, and then decrease. The concentration quenching mechanisms are the d―d interaction by Dexter theory.
Luminescence Characteristics of Dy3+ Activated LiCaBO3 Phosphor
Dy3+激活的LiCaBO3材料发光特性研究

WANG Zhi-Jun,LI Pan-Lai,YANG Zhi-Ping,GUO Qing-Lin,
王志军

无机材料学报 , 2009,
Abstract: 采用固相法制备了LiCaBO3∶Dy3+发光材料. 材料的发射光谱为一多峰宽谱, 主峰分别为484、577和668nm; 监测577nm发射峰, 对应的激发光谱为一主峰位于331、368、397、433、462和478nm的宽谱. 研究了Dy3+浓度对材料发射光谱及发光强度的影响, 结果随Dy3+浓度的增大, 材料的黄、蓝发射峰强度比(Y/B)逐渐增大; 同时, 发光强度呈现先增大后减小的趋势, 最大值对应的Dy3+浓度为3.00mol%, 其浓度猝灭机理为电偶极电偶极相互作用. 引入Li+、Na+或K+可增强材料的发射强度. InGaN管芯激发下的LiCaBO3∶Dy3+材料呈现很好的白光发射, 色坐标为x=0.3001, y=0.3152.
Luminescent Characteristics of LiSrBO3:Eu3+ Phosphor for White Light Emitting Diode

LI Pan-Lai,WANG Zhi-Jun,YANG Zhi-Ping,GUO Qing-Lin,

中国物理快报 , 2009,
Abstract: LiSrBO3:Eu3+ phosphor is synthesized by a high solid-state reaction method, and its luminescent characteristics are investigated. The emission and excitation spectra of LiSrBO3:Eu3+ phosphors exhibit that the phosphors can be effectively excited by near ultraviolet (401nm) and blue (471nm) light, and emit 615nm red light. The effect of Eu3+ concentration on the emission spectrum of LiSrBO3:Eu3+ phosphor is studied; the results show that the emission intensity increases with increasing Eu3+ concentration, and then decreases because of concentration quenching. It reaches the maximum at 3mol%, and the concentration self-quenching mechanism is the dipole-dipole interaction according to the Dexter theory. Under the conditions of charge compensation Li+, Na+ or K+ incorporated in LiSrBO3, the luminescent intensities of LiSrBO3:Eu3+ phosphor are enhanced.
Luminescence and Site Occupancy of Eu2+ in Ba2 Ca(BO3)2

LI Pan-Lai,WANG Zhi-Jun,YANG Zhi-Ping,GUO Qing-Lin,

中国物理快报 , 2011,
Abstract:
Luminescence characteristics of Eu3+ activated borate phosphor for white light emitting diode

Li Pan-Lai,Yang Zhi-Ping,Wang Zhi-Jun,Guo Qing-Lin,

中国物理 B , 2008,
Abstract: In this paper, the Sr3Y2 (BO3)4:Eu3+ phosphor was synthesized by high temperature solid-state reaction method and the luminescence characteristics were investigated. The emission spectrum exhibits one strong red emission at 613nm corresponding to the electric dipole 5D0--7F2 transition of Eu3+ under 365nm excitation, this is because Eu3+ substituted for Y3+ occupied the non-centrosymmetric position in the crystal structure of Sr3Y2 (BO3)4. The excitation spectrum indicates that the phosphor can be effectively excited by ultraviolet (254nm, 365nm and 400nm) and blue (470nm) light. The effect of Eu3+ concentration on the red emission of Sr3Y2 (BO3)4:Eu3+ was measured, the result shows that the emission intensities increase with increasing Eu3+ concentration, then decrease. The Commission Internationale del'Eclairage chromaticity (x, y) of Sr3Y2(BO3)4:Eu3+ phosphor is (0.640,0.355) at 15 mol% Eu3+.
Solitons with Periodic Behavior in an SBN:75 Photorefractive Crystal

GUO Qing-Lin,DENG Gui-Ying,LIANG Bao-Lai,LI Pan-Lai,LI Yan,LI Xu,

中国物理快报 , 2010,
Abstract:
Synthesis of Red Phosphor CaZrO3:Eu3+ for White Light-Emitting Diodes

LI Xu,GUAN Li,AN Jia-Yi,JIN Li-Tao,YANG Zhi-Ping,YANG Yan-Min,LI Pan-Lai,FU Guang-Sheng,

中国物理快报 , 2011,
Abstract:
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