Emission spectra of Tb3+: Bi2O3-B2O3-R2O(R = Li, Na & K) glasses
Emission spectra of Tb3+: Bi2O3-B2O3-R2O(R = Li, Na & K) glasses
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DOI：
10.1007/s10853-005-6533-0
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发表时间：
2005-02
影响因子：
4.5
通讯作者：
K. Annapurna;R. Dwivedi;P. Kundu;S. Buddhudu
中科院分区：
文献类型：
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作者：
K. Annapurna;R. Dwivedi;P. Kundu;S. Buddhudu
基于Bi2O_3的重金属氧化物玻璃具有密度高、折射率高、结合强度低、偏振率高、红外截止波长长、非线性光学系数高以及能够接收大量发光稀土离子等特性，引起了人们的极大关注。特别是，它们的高度非线性光学性质使它们有可能用作超快光开关、光学数据处理设备中的耦合器，以及在光通信和光电子学中应用的激光波导[1-3]。铋系重金属氧化物玻璃表现出宽而平坦的发射带增益，就像碲酸盐玻璃一样，是波分复用(WDM)网络中潜在的光学系统[4]。本文系统地研究了Bi2O_3-B_2O_3和B_2O_3-B_2O_3-R_2O三元系玻璃的形成范围[5]。本文研究了碱对Tb3+：75Bi2O321B2O34R2O(R=Li，Na&K)玻璃发射光谱的影响。采用常规淬火工艺制备了掺Tb(Tb3+)(1mol%)的碱式(Li，Na，K)铋硼酸盐玻璃(75Bi2O321B2O34RO2)。原料为Bi2O_3、H3BO_3、Tb_2O_3和碳酸盐Li、Na、K(Aldrich)。将约10g批次的原料药充分混合，在800-950◦C的铂坩埚中电炉熔化1小时。玻璃熔体在光滑表面的黄铜板之间淬火，制成直径1 cm、厚度0.3 cm的光学玻璃盘。这些玻璃在400◦C的温度下退火一小时，然后缓慢冷却到室温，以消除玻璃中存在的残余应力。用SPEX Fluorolog3-21分光光度计在室温下记录了三种Tb3+(1mol)掺杂的碱(Li，Na，K)铋硼酸盐玻璃的激发光谱和光致发光光谱。激发源为450W连续氙弧灯，垂直安装在风冷外壳中；电磁辐射收集和聚焦采用离轴反射镜，闪光持续时间为3微米S(半高宽)，分辨率为0.01m。由实验数据计算了发射跃迁的平均寿命(τ)
Heavy metal oxide glasses based on Bi2O3 have attracted a great deal of attention due to their interesting properties such as high density, high refractive index, low bond strength, high polarisability, long infrared cut-off wavelength, high nonlinear optical susceptibility and also capability to accept large amounts of luminescent rare earth ions. In particular, their highly nonlinear optical properties make them potential materials for use as ultra-fast optical switches, couplers in optical data processing devices, and as laser waveguides for applications in optical communications and optoelectronics [1–3]. Bismuth based heavy metal oxide glasses have demonstrated wide and flat gain femission bands like in the case of tellurite glasses as potential optical systems in the wavelength division multiplexing (WDM) networks [4]. A systematic study has been carried out on glass formation range in the binary Bi2O3-B2O3 and ternary Bi2O3-B2O3-R2O systems [5]. In the present paper, the objective is to investigate the effects of the alkali on the emission spectra of Tb3+: 75Bi2O3-21B2O3-4R2O (R= Li, Na & K) glasses. Terbium (Tb3+)(1 mol%) doped alkali (Li, Na & K) bismuth-borate glasses in the composition 75Bi2O3-21B2O3-4RO2 were prepared using the conventional quenching technique. The raw chemicals were Bi2O3, H3BO3, Tb2O3 and carbonates of Li, Na and K (Aldrich). About 10 g batches of the raw chemicals were thoroughly mixed and melted in Pt crucibles at 800–950◦ C in an electric furnace for an hour. The glass melts were quenched between smooth surface brass plates to produce 1 cm diameter optical glass discs of 0.3 cm thickness. These were annealed at temperature 400◦ C for one hour and then slowly cooled to room temperature in order to remove the residual stresses that exist in the glasses. The excitation and photoluminescence spectra of three Tb3+(1 mol) doped alkali (Li, Na, K) bismuth borate glasses labeled as Tb3+: Glass-Li, Na & K, respectively, were recorded at the room temperature on a SPEX Fluorolog3-21 spectrophotometer. The excitation source was a 450 W CW Xenon arc lamp, mounted vertically in an air-cooled housing; electromagnetic radiation collection and focusing were by means of an off-axis mirror for source with a flash duration of 3 µs (FWHM) for a resolution of 0.01 m. The average lifetimes (τ) of the emission transitions were computed from the experimental data by means of a