Institute of Experimental Physics, University of Gdansk, Wita Stwosza 57, 80-952 Gdansk, Poland.
J Phys Condens Matter. 2011 Jan 26;23(3):035404. doi: 10.1088/0953-8984/23/3/035404. Epub 2011 Jan 5.
The luminescence properties of KMgF(3):Eu(2 + ) are investigated at different pressures in the temperature range 25-292 K. Five new Eu(2 + ) luminescence (NEL) lines due to the [Formula: see text] transition are identified at 362.49 nm (L(1)), 362.53 nm (L(2)), 360.72 nm (L(3)), 360.15 nm (L(4)) and 359.59 nm (L(5)) together with the line at 359.32 nm (L(0)) which is well known in KMgF(3):Eu(2 + ). The emission lines under excitation at 325 nm show a strong dependence on temperature. At 25 K the emission spectrum consists of only two sharp lines, L(1) and L(2). Three additional lines (L(3), L(4) and L(5)) begin to appear with increasing temperature. With a further increase in temperature from 150 to 292 K all the lines disappear except for the single sharp line at 359.32 nm (L(0)). The zero-phonon transition of line L(0) is accompanied by vibronic sidebands. A pressure shift of five NELs is estimated to be about - 0.6 cm( - 1) kbar( - 1) similarly to the shift of line L(0), while the lifetimes of the NELs are about 0.7 ms which is shorter than that (5.2 ms) of L(0) at 80 K. The new luminescence lines are attributed to the Eu(2 + ) ions occupying the K( + ) sites with fluorine vacancy (F( - ) center) complexes.
研究了 KMgF(3):Eu(2 + )在 25-292 K 温度范围内不同压力下的发光特性。在 362.49nm（L(1)）、362.53nm（L(2)）、360.72nm（L(3)）、360.15nm（L(4)）和 359.59nm（L(5)）处识别出五个新的 Eu(2 + )发光（NEL）线，这些线归因于 [公式：见文本]跃迁，同时还有在 359.32nm（L(0)）处已知的线。在 325nm 激发下，发射线强烈依赖于温度。在 25 K 时，发射光谱仅由两条 sharp 线 L(1)和 L(2)组成。随着温度的升高，开始出现三条额外的线（L(3)、L(4)和 L(5)）。随着温度从 150 升高到 292 K，除了 359.32nm（L(0)）处的单个 sharp 线外，所有线都消失了。线 L(0)的零声子跃迁伴随着振子边带。与线 L(0)的位移类似，估计五条 NEL 的压力位移约为 - 0.6 cm( - 1) kbar( - 1)，而 NEL 的寿命约为 0.7 ms，比 80 K 时 L(0)的寿命（5.2 ms）短。新的发光线归因于 Eu(2 + )离子占据具有氟空位（F( - )中心）复合物的 K( + )位。
