tiCaBO3：Eu^3＋ phosphor was synthesized by high solid-state reaction method, and its luminescent characteristics were investigated. The emission and excitation spectra of LiCaBO3：Eu^3＋ phosphors exhibited that the ...tiCaBO3：Eu^3＋ phosphor was synthesized by high solid-state reaction method, and its luminescent characteristics were investigated. The emission and excitation spectra of LiCaBO3：Eu^3＋ phosphors exhibited that the phosphors could be effectively excited by near ultraviolet （400 nm） and blue （470 nm） light, and emitted red light. The effect of Eu^3＋ concentration on the emission spectrum of LiCaBO3：Eu^3＋ phosphor was studied. The results showed that the emission intensity increased with increasing Eu^3＋ concentration, and then decreased because of concentration quenching. It reached the maximum at 3mol.% Eu^3＋, and the concentration self-quenching mechanism was the d-d interaction according to the Dexter theory. Under the conditions of charge compensator Li^＋, Na^＋ or K^＋ incorporated in LiCaBO3, the emission intensities of LiCaBO3：Eu^3＋ phosphor were enhanced.展开更多
A novel green phosphor,LiCaBO3:Tb3+,was synthesized by solid state reaction method,its luminescence characteristics were investigated,and the formation of phosphors were confirmed by X-ray powder diffraction(XRD).Its ...A novel green phosphor,LiCaBO3:Tb3+,was synthesized by solid state reaction method,its luminescence characteristics were investigated,and the formation of phosphors were confirmed by X-ray powder diffraction(XRD).Its excitation band extended from 220 to 400 nm,which was coupled well with the emission of UV LED(350-410 nm).It exhibited a strong green emission located at 544 nm with chromatic coordination(0.25,0.58).The emission intensities of LiCaBO3:Tb3+ phosphor were influenced by varying Tb3+ concentratio...展开更多
Lithium calcium borate （LiCaBO3） polycrystalline thermoluminescence （TL） phosphor doped with rare earth （Tb3＋ and Dy3＋） elements was synthesized by novel solution combustion synthesis. The reaction produced ve...Lithium calcium borate （LiCaBO3） polycrystalline thermoluminescence （TL） phosphor doped with rare earth （Tb3＋ and Dy3＋） elements was synthesized by novel solution combustion synthesis. The reaction produced very stable crystalline LiCaBO3：D（D=Tb3＋ and Dy3＋） phosphors. These rare earth doped phosphors material showed maximum TL sensitivity with favorable glow curve shape. TL glow curve of X-ray irradiated that LiCaBO3：Tb3＋ and LiCaBO3：Dy3＋ samples showed two major well-separated glow peaks. The TL sensitivity of these phosphors to X-ray radiation was comparable with that of TLD-100（Harshaw）. Photoluminescence spectra of LiCaBO3：Tb3＋ and LiCaBO3：Dy3＋ showed the characteristic Tb3＋ and Dy3＋ peaks respectively. TL response to X-ray radiation dose was linear up to 25 Gy.展开更多
基金supported by Hebei Provincial Technology Development Foundation (51215103b)Science Foundation of Hebei University (2006Q06)Natural Science Foundation of Hebei Province (E2009000209)
文摘tiCaBO3：Eu^3＋ phosphor was synthesized by high solid-state reaction method, and its luminescent characteristics were investigated. The emission and excitation spectra of LiCaBO3：Eu^3＋ phosphors exhibited that the phosphors could be effectively excited by near ultraviolet （400 nm） and blue （470 nm） light, and emitted red light. The effect of Eu^3＋ concentration on the emission spectrum of LiCaBO3：Eu^3＋ phosphor was studied. The results showed that the emission intensity increased with increasing Eu^3＋ concentration, and then decreased because of concentration quenching. It reached the maximum at 3mol.% Eu^3＋, and the concentration self-quenching mechanism was the d-d interaction according to the Dexter theory. Under the conditions of charge compensator Li^＋, Na^＋ or K^＋ incorporated in LiCaBO3, the emission intensities of LiCaBO3：Eu^3＋ phosphor were enhanced.
基金supported by Natural Science Foundation of Hebei Province (E2009000209, F2009000217)Hebei Provincial Technology Development Foundation (51215103b)+1 种基金Science Foundation of Hebei University (2006Q06)National Natural Science Foundation of China (50902042)
文摘A novel green phosphor,LiCaBO3:Tb3+,was synthesized by solid state reaction method,its luminescence characteristics were investigated,and the formation of phosphors were confirmed by X-ray powder diffraction(XRD).Its excitation band extended from 220 to 400 nm,which was coupled well with the emission of UV LED(350-410 nm).It exhibited a strong green emission located at 544 nm with chromatic coordination(0.25,0.58).The emission intensities of LiCaBO3:Tb3+ phosphor were influenced by varying Tb3+ concentratio...
基金Project supported by University Grant Commission, New Delhi (UGC/F.1/37-332/2009(SR))
文摘Lithium calcium borate （LiCaBO3） polycrystalline thermoluminescence （TL） phosphor doped with rare earth （Tb3＋ and Dy3＋） elements was synthesized by novel solution combustion synthesis. The reaction produced very stable crystalline LiCaBO3：D（D=Tb3＋ and Dy3＋） phosphors. These rare earth doped phosphors material showed maximum TL sensitivity with favorable glow curve shape. TL glow curve of X-ray irradiated that LiCaBO3：Tb3＋ and LiCaBO3：Dy3＋ samples showed two major well-separated glow peaks. The TL sensitivity of these phosphors to X-ray radiation was comparable with that of TLD-100（Harshaw）. Photoluminescence spectra of LiCaBO3：Tb3＋ and LiCaBO3：Dy3＋ showed the characteristic Tb3＋ and Dy3＋ peaks respectively. TL response to X-ray radiation dose was linear up to 25 Gy.
