Long Qiang, Wang Chuang, Ding Jianyan, Li Yanyan, Wu Quansheng, Wang Yuhua
Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Key Laboratory of Special Function Materials and Structure Design, Ministry of Education, Lanzhou University, Tianshui South Road No. 222, Lanzhou, Gansu 730000, PR China.
Dalton Trans. 2015 Aug 28;44(32):14507-13. doi: 10.1039/c5dt02368h.
A near-UV excited phosphor, LiSr4(BN2)3:Eu(2+) (LSBN:Eu(2+)), was synthesized using a solid-state reaction at 800 °C. The crystal structure of LSBN had been refined and determined from the XRD profiles by the Rietveld refinement method, which belongs to the space group Im3[combining macron]m with the lattice constants a = b = c = 7.46112(23) Å. The excitation spectra of the LSBN:Eu(2+) phosphors were centered at around 370 nm and covered the range from 300 to 450 nm. Under 400 nm excitation, the emission spectra of the LSBN:Eu(2+) phosphors show a red emission centered at about 640 nm (FWHM ≈ 130 nm). And the energy transfer between the Eu(2+) ions is confirmed to arise from the electric dipole-dipole interactions. The nontypical emission blue-shift in the single luminescence center with increasing temperature luminescence properties is also investigated. The results indicate that LSBN:Eu(2+) could be conducive to the development of white light emitting diodes.
采用固态反应在800℃合成了一种近紫外激发荧光粉LiSr4(BN2)3:Eu(2+)（LSBN:Eu(2+)）。通过Rietveld精修方法从XRD图谱中对LSBN的晶体结构进行了精修和测定，其属于空间群Im3[combining macron]m，晶格常数a = b = c = 7.46112(23) Å。LSBN:Eu(2+)荧光粉的激发光谱以370 nm左右为中心，覆盖300至450 nm范围。在400 nm激发下，LSBN:Eu(2+)荧光粉的发射光谱呈现出以约640 nm为中心的红色发射（半高宽≈130 nm）。并且证实Eu(2+)离子之间的能量转移源于电偶极 - 偶极相互作用。还研究了单发光中心随温度升高发光特性时非典型的发射蓝移现象。结果表明，LSBN:Eu(2+)有利于白光发光二极管的发展。
