NIR to visible up conversion in Er3+-doped fluoride glass under 1550 and 980 nm excitations
NIR to visible up conversion in Er3+-doped fluoride glass under 1550 and 980 nm excitations
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DOI：
10.1016/j.ceramint.2014.08.057
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发表时间：
2015-01-01
影响因子：
5.2
通讯作者：
Chen, Danping
中科院分区：
文献类型：
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作者：
Huang, Feifei;Hu, Lili;Chen, Danping
研究了掺Er3+氟化玻璃在1550 nm和980 nm下的上转换发光特性。得到了488nm激发下的发射光谱，并与之进行了比较。测试了吸收和发射光谱，清晰地观察到可见光到红外发射（520、550、6667、800、850、980、1535和2708 nm）。从980或1550 nm到绿色或红色可见光的上转换发光分别是两个或三个光子的过程。在488 nm和980 nm激发下，样品的红绿发射强度比分别为0.06和0.11。然而，在1550 nm泵浦下观测到明显更亮的红色发射，比值高达12.5，这主要是由I-4（9/2）和I-4（11/2）水平之间的非辐射衰变过程决定的。此外，根据Er3+的能级图和上转换发光光谱，讨论了多光子吸收和能量传递过程的上转换机理。这些结果有助于研究上转换发光材料，特别是Er3+掺杂玻璃。(C) 2014 Elsevier Ltd and Techna Group S.r.l版权所有
The upconversion luminescence of Er3+-doped fluoride glass under 1550 and 980 nm pumpings is investigated. The emissions pumped by 488 nm excitation is also obtained and used as a comparison. Absorption and emission spectra are tested and visible to infrared emissions (520, 550, 667, 800, 850, 980, 1535, and 2708 nm) are clearly observed. Upconversion luminescence from 980 or 1550 nm to green or red visible luminescence is a two or three-photon process, respectively. The red to green emission intensity ratios are 0.06 and 0.11 when the sample is excited under 488 and 980 nm pumpings, respectively. However, significantly brighter red emission is observed under 1550 nm pumping and the ratio is as high as 12.5, which is most decided by non-radiative decay processes between I-4(9/2) and I-4(11/2) levels. In addition, mechanisms of the upconversion by multiphoton absorption and energy transfer processes are discussed based on the energy-level diagram of Er3+ and upconversion luminescence spectra. These results benefit investigations on upconversion luminescence materials, particularly Er3+-doped glasses. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.