CAJ | 학술논문

利用水热法合成了氟化物Y_(0.795-x)Gd_xYb_(0.2)Tm_(0.005)F_3 (x=0.0,0.1,0.2,0.5,0.8)纳米晶.研究了退火后系列样品的上转换发光性质以及激发态辐射跃迁寿命.在980 nm激发下,Y_(0.795-x)Gd_xYb_(0.2)Tm_(0.005)F_3 纳米微晶样品中观察到了Tm~(3+)的蓝光上转换发射及紫色、紫外发射增强现象,同时还观察到Gd~(3+)的~6D_(9/2)、~6I_J、~6P_(5/2)及~6P_(7/2)到基态~8S_(7/2)的发射.实验结果表明:样品半个波长量级的颗粒尺寸是Tm~(3+)紫外上转换增强以及Tm~(3+)到Gd~(3+)发生有效能量传递的重要因素.
이용수열법합성료불화물Y_(0.795-x)Gd_xYb_(0.2)Tm_(0.005)F_3 (x=0.0,0.1,0.2,0.5,0.8)납미정.연구료퇴화후계렬양품적상전환발광성질이급격발태복사약천수명.재980 nm격발하,Y_(0.795-x)Gd_xYb_(0.2)Tm_(0.005)F_3 납미미정양품중관찰도료Tm~(3+)적람광상전환발사급자색、자외발사증강현상,동시환관찰도Gd~(3+)적~6D_(9/2)、~6I_J、~6P_(5/2)급~6P_(7/2)도기태~8S_(7/2)적발사.실험결과표명:양품반개파장량급적과립척촌시Tm~(3+)자외상전환증강이급Tm~(3+)도Gd~(3+)발생유효능량전체적중요인소.
Y_(0.795-x)Gd_xYb_(0.2)Tm_(0.005)F_3 nanocrystals were synthesized through a hydrothermal method. After annealing in the air conditions, the upconversion (UC) emission properties under a 980 nm continuous wave semiconductor laser diode excitation were studied. The experimental results suggested that the violet and ultraviolet (UV) UC emission enhancement were observed in Y_(0.795-x)Gd_xYb_(0.2)Tm_(0.005)F_3 nanocrystals, as well as the UC emissions from ~6D_(9/2), ~6I_J, ~6P_(5/2), and ~6P_(7/2) states to the ground state ~8S_(7/2) of Gd~(3+) were shown, too. The luminescent kinetic analysis implied that, under 980 nm excitation, Yb~(3+) can transfer energy to populate the ~3P_2 level of Tm~(3+), make UV, violet, and blue UC emissions obtained, further, the ~6I_J multiplets of Gd~~(3+) were populated through the energy transfer process ~3P_2 → ~3H_6 (Tm~(3+)):~8S_~(7/2) → ~6I_J (Gd~(3+)). At the same time, the energy transfer processes occurred between Gd~(3+) and Yb~(3+) or Tm~(3+) based on the energy matching conditions, leading to the above mentioned UV UC emissions of Gd~(3+).