摘要
采用高温固相法合成了Sr1-x-yMgP2O7:xCe3+,yTb3+荧光粉.研究了荧光粉的晶体结构、发光特性、荧光寿命、能量传递机理和荧光粉的热稳定性.研究结果表明:在SrMgP2O7基质中,Ce3+的发射峰值为398nm,Tb3+的主发射峰值为545nm,它们分别属于5d-4f跃迁和5D4→7F5跃迁.Ce3+和Tb3+共掺时,Ce3+和Tb3+通过电偶极子-电偶极子相互作用发生能量传递,能量传递的临界距离为0.614nm.通过计算得到单掺杂Ce3+、Tb3+时热猝灭过程的激活能分别为0.122和0.111eV,Tb3+离子的发光热稳定性比Ce3+离子的好.
Sr 1-x-y MgP 2 O 7 ：xCe 3＋ ,yTb 3＋ phosphors were successfully synthesized by a solid-state reaction method.The crystal structure,optical properties,luminescence decay,energy transfer,and thermal stability properties were investigated.The results showed that the emission peaks of the co-doped Ce 3＋ and Tb 3＋ ions in the SrMgP 2 O 7 host were located at 398 and 545 nm,respectively.The peaks were attributed to 5d-4f and 5 D 4 → 7 F 5 transitions,respectively.An efficient energy transfer from the Ce 3＋ to Tb 3＋ ions by means of dipole-dipole interactions was observed and the critical distance of the energy transfer was 0.614 nm. The thermal activation energies of 0.122 and 0.111 eV for SrMgP 2 O 7 ：Ce 3＋ and SrMgP 2 O 7 ：Tb 3＋ ,respectively, were obtained from the temperature dependent（313-453 K）luminescence intensities.The Tb 3＋ ion was found to be superior to Ce 3＋ ion in the thermal stability of light-emitting diodes.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2012年第3期699-705,共7页
Acta Physico-Chimica Sinica
基金
广东省教育部产学研结合项目(2010B090400021)资助~~
关键词
发光特性
荧光寿命
能量传递
热稳定性
Optical property
Luminescence decay
Energy transfer
Thermal stability
