Institute of Experimental Physics, University of Gdańsk, Gdańsk, Poland.
J Phys Condens Matter. 2012 May 30;24(21):215402. doi: 10.1088/0953-8984/24/21/215402. Epub 2012 Apr 27.
Steady state and time resolved luminescence measurements of CaMoO(4) doped with Pr(3+) as a function of hydrostatic pressure in the 1-175 kbar range are presented. It has been observed that with increasing pressure the spectral features shift towards lower energies, the decay times of both (3)P(0) and (1)D(2) emitting levels become shorter and the intensity of the (3)P(0) emission decreases to complete quenching at about 110 kbar, whereas that of the (1)D(2) emission increases in the 0-100 kbar range and then rapidly decreases when the pressure exceeds 127 kbar. A variation of the structure of the spectral manifolds indicates that a pressure induced phase transition of the host lattice occurs in the 80-100 kbar range. The quenching of the luminescence and the shortening of the decay times have been accounted for by means of a model that takes into account the role played by a praseodymium trapped exciton in the excited state dynamics of the investigated material.
我们对 CaMoO(4) 基质中掺杂 Pr(3+)的稳态和时间分辨荧光光谱进行了研究，实验压力范围为 1-175 kbar。研究发现，随着压力的增加，光谱特征向低能方向移动，（3）P(0)和（1）D(2)发射能级的衰减时间变短，（3）P(0)发射强度降低，在约 110 kbar 时完全猝灭，而（1）D(2)发射强度在 0-100 kbar 范围内增加，当压力超过 127 kbar 时迅速降低。光谱多重线结构的变化表明，在 80-100 kbar 范围内，宿主晶格发生了压力诱导的相变。通过考虑掺杂的镨陷俘激子在研究材料的激发态动力学中所起的作用，我们提出了一个模型来解释荧光猝灭和衰减时间缩短的现象。
