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Spectroscopy and upconversion processes in YAlO_3:Ho~3+ crystals

机译:YAlO_3:Ho〜3 +晶体的光谱学和上转换过程

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Emission from the high lying excited states, energy transfer, and upconversion processes are investigated in YAlO_3Ho~3-. Selectively excited emission spectra in the range from 300 to 800 nm starting from the 3~D_3, 3~G_5 5~F_3 5~S_2 and 5~F_5 multiplets were measured at l5 K. This, together with the detailed absorption and excitation measurements at l5 K allowed determination of the Stark energy levels of Ho~3-- ions in YAlO_3 up to UV energies. The 5~S_2 fluorescence decays were recorded as a function of temperature and Ho~3- concentration in order to investigate the process of quenching of fluorescence due to cross relaxation among two ions. Conversion of red and infrared laser radiation to green 5~S_2 and blue 5~F_3 emission is reported. Under pu1sed resonant excitation of the 5~F_5 or 5~I_5 levels the upconversion was found to be due to energy transfer process between two excited ions. The photon avalanche effect was observed under cw excitation around 585 nm.
机译:在YAlO_3Ho〜3-中研究了高激发态的发射,能量转移和上转换过程。从3〜D_3、3〜G_5 5〜F_3 5〜S_2和5〜F_5多重峰开始,在300至800 nm范围内的选择性激发发射光谱在15 K下测量。这与详细的吸收和激发测量15 K可以确定YAlO_3中直至紫外线能量的Ho〜3-离子的斯塔克能级。记录5〜S_2荧光衰减与温度和Ho〜3-浓度的关系,以研究由于两个离子之间的交叉弛豫导致的荧光猝灭过程。据报道,红色和红外激光辐射转换为绿色5〜S_2和蓝色5〜F_3发射。在5〜F_5或5〜I_5能级的共振激发下,发现上转换是由于两个激发离子之间的能量转移过程。在585nm附近的cw激发下观察到光子雪崩效应。

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