Energy transfer and upconversion luminescence in Tm3+/Yb3+ co-doped lanthanum zinc lead tellurite glasses

摘要: A series of Tm3+/Yb3+ co-doped lanthanum-zinc-lead-tellurite (TPZL) glasses pumped by a 980 nm laser diode (LD) were demonstrated to obtain high efficiency infrared-to-visible upconversion. Effects PbO content on the thermal stability, structure and upconversion properties TPZL had been investigated. The efficient visible fluorescences corresponding 1G4→3H6, 1G4→3F4 3H4→3H6 transitions Tm3+ observed under excitation. intensities blue, red near infrared emissions in obviously enhanced with increasing content. dependence excitation power possible mechanisms evaluated proper rate equation model. Population density different levels coefficients energy transfer CDi (i=2, 4, 6) between Yb3+ estimated fitting simulated curves measured ones. obtained three CD2, CD4, CD6 determined be 5.7×10−17, 1.3×10−16 8.6×10−17 cm3/s, respectively.