摘要
以 M2 B4 O7( M=Na,K)为基质 ,在空气中掺杂稀土元素 Eu3+ 得到了 Na2 B4 O7∶ Eu3+ 和 K2 B4 O7∶ Eu3+荧光体 .探讨了体系的烧结条件和荧光性质 ,分析了晶体的结构 .结果表明 ,虽然两种体系的最佳合成条件不同 ,但是体系中都同时存在 [BO4 ]和 [BO3]结构 ;稀土离子 Eu3+ 的发光以电偶极跃迁5D0 -7F2 为主 ,处于非中心对称的格位上 ,并且可以很好地存在于基质中 ,Na2 B4 O7∶Eu3+
M 2B 4O 7∶Eu 3+(M=Na, K) phosphors were synthesized by solid state reaction in ambient air. The optimum preparing conditions were studied and phase analyses were carried out by using powder XRD method. The structure of the borates contains both [BO 3] and [BO 4] coordination polyhedra. The luminescent properties of M 2B 4O 7∶Eu 3+ under ultraviolet light excitation were studied. The results show that the predominant emission of Eu 3+ is 5D 0- 7F 2 transition, demonstrating that the rare earth ions occupy the non-centrosymmetrical sites in M 2B 4O 7 and Eu 3+ ion can be stable in the matrix. The intensity of emission of Na 2B 4O 7∶Eu 3+ is stronger than that of K 2B 4O 7∶Eu 3+ when the doped Eu 3+ concentration is the same.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第10期1789-1792,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金 (批准号 :90 2 0 10 3 2 )资助
