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采用坩埚下降法生长出Ho~(3+)离子掺杂浓度~1.90 mol%、Tm~(3+)不同掺杂离子浓度(0.99mol%,1.58mol%,2.37 mol%,3.16 mol%,3.99 mol%,7.19 mol%)的双掺杂立方晶相NaYF_4单晶体.根据测定的吸收光谱以及800nmLD波长激发下的发射光谱、发射截面和衰减曲线,研究从Tm~(3+)离子到Ho~(3+)离子的能量传递机制、Tm~(3+)离子的浓度猝灭效应和Ho~(3+)离子在2.04μm波段的优化发光效应.当Ho~(3+)离子浓度保持为~1.90 mol%不变,Tm~(3+)离子浓度从0.99 mol%增加到1.59mol%时,2.04μm波段的发射强度逐步增强;当浓度从1.59mol%增加到7.19mol%时,发射强度逐步减弱.Ho~(3+)(1.90 mol%)/Tm~(3+)(1.59 mol%)共掺的单晶体的发射截面最大,达到2.17×10-20 cm~2,其荧光寿命最长,为21.72ms;同时,根据Ho~(3+)离子的吸收截面和Tm~(3+)离子的发射截面,计算得到该样品从Tm~(3+)∶3F~(3+)4→Ho∶5I7稀土离子能量传递系数和Ho~(3+)∶~5I_7→Tm~(3+)∶~3F_4反传递系数分别为C_(Tm-Ho)=24.14×10~(-40)cm~6/s,C_(Ho-Tm)=2.05×10~(-40) cm~6/s.
The doping concentrations of Ho ~ (3+) ~ 1.90 mol% and Tm ~ (3 +) with different dopant concentrations (0.99 mol%, 1.58 mol%, 2.37 mol%, 3.16 mol%, 3.99 mol%, 7.19 mol%) .According to the measured absorption spectra and the emission spectra, emission cross section and decay curve under the excitation of 800nm LD, the crystal structure of NaYF_4 single crystals from Tm ~ (3+) to Ho ~ 3 +) ions, the concentration quenching effect of Tm ~ (3+) ions and the optimized luminescence of Ho 3+ ions in the 2.04μm band.When the concentration of Ho 3+ ions remains at ~ 1.90 mol%, the emission intensity of 2.04μm increased gradually when the concentration of Tm 3+ increased from 0.99 mol% to 1.59mol%. When the concentration increased from 1.59mol% to 7.19mol%, the emission intensity gradually increased The emission cross section of the co-doped single crystal withHe ~ (3 +) (1.90 mol%) / Tm ~ (3 +) (1.59 mol%) is the largest, reaching 2.17 × 10-20 cm ~ Is 21.72ms. At the same time, according to the absorption cross section of Ho 3+ ion and the emission cross section of Tm 3+ ion, the sample is calculated from Tm 3+: 3F 3+ 4 → Ho : 5I7 rare earth ion energy transfer coefficient and Ho ~ (3+): ~ 5I_7 → Tm ~ (3+): ~ 3F_4 anti-transfer coefficient Is C_ (Tm-Ho) = 24.14 × 10 ~ (-40) cm ~ 6 / s, C_ (Ho-Tm) = 2.05 × 10 ~ (-40) cm ~ 6 / s.