Upconversion luminescense properties of holmium co-doped ZrF₄—BiF₃ ceramics

Abstract

The conversion of infrared radiation of a Tm 3+ :YAP laser at a wavelength of 1.93 µm into visible light in [(ZrF 4 ) 0.4 -(BiF 3 ) 0.6 ] 100−x -(HоF 3 ) x (x = 1.5 or 5 wt%) ceramic samples was investigated. The emission bands at wavelengths of 650 nm, 900 nm and 1100 nm corresponding to transitions from 5 F 5 , 5 I 5 and 5 I 6 levels to the ground state 5 I 8 were observed in upconversion luminescence spectra. From the experimental data, an estimate of the crossrelaxation coefficient from 5 S 2 was obtained. It was K cr ≈ 1 × 10 −16 cm 3 s −1 . The threshold power density of Tm 3+ :YAP laser, at which a luminescence was observed on the ceramic samples, was about 0.85 W cm −2 .

Influence of Eu3+ ions on 1.5 µm luminescence of Er3+ in TeO2–ZnO–Bi2O3 glasses

“…Then, the cross-relaxation coefficient K cr for this state can be found as K cr = τ cr −1 /N 0 , where N 0 is the concentration of erbium ions [31].…”

Ап-конверсионная люминесценция твердых растворов CaF-=SUB=-2-=/SUB=--SrF-=SUB=-2-=/SUB=--HoF-=SUB=-3-=/SUB=- при возбуждении на уровень -=SUP=-5-=/SUP=-I-=SUB=-7-=/SUB=- ионов Ho-=SUP=-3+-=/SUP=-

“…Стоит заметить, что материалы, легированные ионами Ho 3+ , также обладают эффективной ап-конверсионной люминесценцией при возбуждении ИК излучением на энергетические уровни 5 I 6 [28,29] и 5 I 7 [30][31][32][33][34][35][36][37]. Ранее ап-конверсионная люминесценция ионов Ho 3+ при возбуждении на уровень 5 I 7 была исследована в материалах CaF 2 [30][31][32], SrF 2 [32,33], ZBLAN [34,35], PbF 2 [36], ZrF 4 −BiF 3 [37].…”