Hydrothermal synthesis of Yb^(3+),Tm^(3+) co-doped Gd_6MoO_(12) and its upconversion properties

Yb3＋, Tm3＋ co-doped Gd6MoO12 phosphors with different morphologies are prepared by the hydrothermal method. The dendrites present different morphologies （including hexagonal prisms, spindles, and spheres） after changing the pH value and edetate disodium （EDTA） usage. It is found that each of the two factors plays a crucial role in forming different morphologies. The up-conversion （UC） luminescence is studied. Under 980-nm semiconductor laser excitation, relatively strong blue emission and weak red emission are observed. Finally, the effect of pumping power on the UC luminescence properties and the level diagram mechanism of Gd6MoO12：yb3＋/Tm3＋ phosphor are also discussed.

液相法制备掺杂半导体纳米晶研究进展

掺杂即为有目的地将某些杂质原子掺入基体材料中,调控半导体材料能级结构以及空穴或电子的浓度,从而改变宿主半导体的电学、光学、磁学性能。纳米晶由于尺寸太小,存在"自清洁"、"自淬灭"、"自补偿"等效应,使得纳米晶的稳定掺杂及电子掺杂态的调控难以实现。本文综述了近年来掺杂半导体纳米晶的的液相制备方法以及过渡金属发光离子、磁性离子以及稀土离子掺杂的半导体纳米晶的光电性能及应用。并进一步讨论了掺杂纳米晶在未来面临的挑战和发展趋势。