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本文用水热法合成了YP_5O_(14):Ho~(3+)、Er~(3+)、Tm~(3+)晶体,最大线度为49mm。测定了晶体的紫外可见吸收,激发和荧光光谱。观察到Ho~(3+)离子的~3K_7,Er~(3+)离子的~4G_(11/2)和Tm~(3+)离子的~1D_2能级有强的叠加吸收。用380nm激发,Ho~(3+)离子的~5S_2和Er~(3+)离子的~4S_(3/2)能级绿色荧光(550nm)发射较强,可望是一种绿色发光材料。值得注意的是引入Tm~(3+)离子会强化绿色发射。本文还讨论了Ho~(3+)—Er~(3+)离子间的敏化及Tm~(3+)→Ho~(3+),Er~(3+)离子的能量转移。
In this paper, YP_5O_ (14): Ho ~ (3 +), Er ~ (3 +) and Tm ~ (3 +) crystals were synthesized by hydrothermal method with the maximum linearity of 49mm. The UV-Vis absorption, excitation and fluorescence spectra of the crystals were determined. It is observed that the ~ 1 D 2 energy levels of ~ 4 G_ (11/2) and Tm ~ (3 +) ions of ~ 3 K_7 and Er ~ (3+) ions of Ho 3+ ions have strong superposition absorption. With 380nm excitation, ~4S 3/2 emission of ~ 5S_2 and Er ~ (3+) ions of Ho ~ (3+) ions is stronger than that of the others, which is expected to be a green luminescent material. It is noteworthy that the introduction of Tm ~ (3 +) ions will enhance the green emission. In addition, the sensitization of Ho ~ (3 +) - Er ~ (3+) ions and the energy transfer of Tm ~ (3+) → Ho ~ (3 +) and Er ~ (3+) ions were also discussed.