Ho3+/Yb3+共掺氟氧化物玻璃陶瓷的上转换发光特性  

Up-conversion Luminescence Properties of Ho3+/Yb3+ Co-doped Glass Ceramic

作　　者：邓亚静 牛春晖 DENG Ya-jing;NIU Chun-hui(School of Instrument Science and Opto Electronics Engineering,Beijing Information Science & Technology University,Beijing 100192,China)

机构地区：[1]北京信息科技大学仪器科学与光电工程学院

出　　处：《发光学报》2019年第7期857-864,共8页Chinese Journal of Luminescence

基　　金：北京市自然科学基金(4154071);北京市优秀人才培养资助青年骨干个人项目(201400002012G105)资助~~

摘　　要：以52SiO2-8Na2CO3-16Al2O3-33NaF-3LuF3-0.15Yb2O3-0.03Ho2O3的配比方式,在1500℃的温度下通过高温熔融法制备了Ho^3+/Yb^3+共掺杂的氟氧化物玻璃样品和玻璃陶瓷样品。运用Judd-Ofelt理论研究样品的光谱特性。根据吸收谱计算得到的谱线强度参数Ωλ(λ=2,4,6),从而计算出理论振子强度和实验振子强度,二者的均方根差为δrms=8.23×10^-7。计算了Ho^3+的各个能级跃迁的跃迁几率、跃迁分支比及能级寿命参数。结果表明:(1)5I7级寿命较长,为0.28ms,适合作为上转换中间能级;(2)5I6→5I8能级的跃迁分支比为90.90%,可用于产生1167nm的激光。在980nm红外激光的激发下,Ho^3+/Yb^3+共掺杂的玻璃陶瓷具有强绿色(550nm)上转换荧光和较强红色(650nm)上转换荧光,绿光和红光分别对应5S2,5F4→5I8和5F5→5I8的能级跃迁。根据上转换发射功率与980nmLD激光器功率的关系估算出跃迁过程吸收光子数目分别为2.16和2.18,由此确定出该跃迁过程为双光子吸收过程。结果表明,玻璃陶瓷在绿色上转换发光材料中具有潜在的应用价值。Ho^3+/Yb^3+ co-doped glass ceramic sample was prepared with the molar ratios of 52SiO2-8Na2CO3-16Al2O3-33NaF-3LuF3-0.15Yb2O3-0.03Ho2O3 by the high temperature melting method in 1 500 ℃. The spectrum property was studied by using Judd-Ofelt theory. Spectral strength parameters Ωλ(λ=2,4,6) were computed based on the absorption peak s area of the absorption spectrum. The theoretical oscillator strength and the experimental oscillator strength were calculated according to the spectrum strength parameters,and the root mean square deviation (δ rms ) of them was 8.23×10^-7 . The parameters such as transition probability,decay branching ratios and level lifetime of Ho 3+ were obtained. The result shows that the lifetime of metastable level 5I7 was longer of 0.28 ms ,which was suitable for up-conversion intermediate level. And the decay branching ratio of 5I6→ 5I8 (corresponding to the wavelength of 1 167 nm) was the most of 90.90%. Under the excitation of 980 nm diode laser,up-conversion luminescence was observed at the wavelength of 550 nm and 650 nm,corresponding to the radiative transitions of Ho^3+: 5S2,5F4→ 5I8 and 5F5→5I8,respectively. The two-photon absorption of three emission peaks was determined by the fitting curve graph of sample up-conversion emission power and the laser pumping power,when absorption of the photon number in turn was 2.16 and 2.18.

关 键 词：玻璃陶瓷 上转换发光 JUDD-OFELT理论 双光子吸收 

分 类 号：O482.31[理学—固体物理]