Wang Zhi-Jun, Li Pan-Lai, Yang Zhi-Ping, Guo Qing-Lin
College of Physics Science & Technology, Hebei University, Baoding 071002, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2009 Nov;29(11):2914-6.
LiM (M = Ca, Sr, Ba) BO3 : Tb3+ phosphors were synthesized by solid state reaction. The starting materials CaCO3, SrCO3, BaCO3, H3 BO3, Li2 CO3, Na2 CO3, K2 CO3 and Tb4 O7 (99.99% in mass) in appropriate stoichiometric ratio were mixed in the alumina crucible, then the mixed powders were calcined at 700 degrees C for 2 h, and LiCaBO3 : Tb3+, LiSrBO3 : Tb3+ and LiB-aBO3 : Tb3+ phosphors were obtained. The emission and excitation spectra were measured by a Shimadzu RF-540 ultraviolet spectrophotometer. All the photoluminescence properties of these phosphors were measured at room temperature. The emission spectra of LiM (M = Ca, Sr, Ba) BO3 : Tb3+ phosphors show several bands, and the main emission peaks correspond to the 5D4 --> 7F6(486, 486, 488 nm), 5D4 --> F5 (544, 544, 544 nm), 5D4 --> 7F4 (590, 595, 593 nm) and 5D4 --> 7F3 (620, 620, 616 nm) typical transitions of Tb3+, and the typical transitions of Tb3+ happens to split because of the effects of LiM (M = Ca, Sr, Ba) BO3 crystals field. The excitation spectra for the 544 nm green emission of LiM (M = Ca, Sr, Ba)BO3 : Tb3+ phosphors illuminate that these kinds of phosphors can be effectively excited by ultraviolet (350-410 nm) light, and emit green light, therefore, they are promising phosphors for white light emitting diodes. Effects of activation and charge compensation on the luminescence intensities of LiM (M = Ca, Sr, Ba) BO3 : Tb3+ phosphors were studied, and the results show that the intensities were obviously effected.
采用固相反应法合成了LiM（M = Ca、Sr、Ba）BO₃ : Tb³⁺荧光粉。将化学计量比合适的起始原料碳酸钙、碳酸锶、碳酸钡、硼酸、碳酸锂、碳酸钠、碳酸钾和氧化铽（质量分数99.99%）在氧化铝坩埚中混合，然后将混合粉末在700℃下煅烧2小时，得到LiCaBO₃ : Tb³⁺、LiSrBO₃ : Tb³⁺和LiBaBO₃ : Tb³⁺荧光粉。用岛津RF - 540紫外可见分光光度计测量发射光谱和激发光谱。这些荧光粉的所有光致发光性能均在室温下测量。LiM（M = Ca、Sr、Ba）BO₃ : Tb³⁺荧光粉的发射光谱呈现多个谱带，主要发射峰对应于Tb³⁺的5D₄→7F₆（486、486、488 nm）、5D₄→7F₅（544、544、544 nm）、5D₄→7F₄（590、595、593 nm）和5D₄→7F₃（620、620、616 nm）典型跃迁，并且由于LiM（M = Ca、Sr、Ba）BO₃晶体场的作用，Tb³⁺的典型跃迁恰好发生了分裂。LiM（M = Ca、Sr、Ba）BO₃ : Tb³⁺荧光粉在544 nm处绿色发射的激发光谱表明，这类荧光粉能被紫外光（350 - 410 nm）有效激发并发射绿光，因此，它们是用于白光发光二极管很有前景的荧光粉。研究了激活和电荷补偿对LiM（M = Ca、Sr、Ba）BO₃ : Tb³⁺荧光粉发光强度的影响，结果表明发光强度受到了显著影响。
