A systematic interpretation of the quantum cutting effect by a cooperative energy transfer mechanism in Te4+/Yb3+ co-doped tellurite glasses

Rufino Souza, Ana Kely; Silva, Junior Reis; Costa, Francine Bettio [UNESP]; Silos Moraes, Joao Carlos [UNESP]; Oliveira Nunes, Luiz Antonio de; Cunha Andrade, Luis Humberto da; Lima, Sandro Marcio

A systematic interpretation of the quantum cutting effect by a cooperative energy transfer mechanism in Te4+/Yb3+ co-doped tellurite glasses

Data

2023-06-01

Autores

Rufino Souza, Ana Kely

Silva, Junior Reis

Costa, Francine Bettio

Silos Moraes, Joao Carlos

Oliveira Nunes, Luiz Antonio de

Cunha Andrade, Luis Humberto da

Lima, Sandro Marcio

Tipo

Artigo

Resumo

The near-infrared downconversion (DC) mechanism in Te4+/Yb3+ co-doped 75TeO2–25Li2O tellurite glasses (amounts in mol%) was closely followed using optical and thermal spectroscopy techniques. The glasses were prepared by the conventional melt-quenching method, with a melting temperature of 800 °C, in an ambient atmosphere, which were the best synthesis conditions for observing Te4+ in the glass. The results indicated that excitation in the ultraviolet region led to an intense emission of two NIR photons (at around 978 nm) in the co-doped tellurite glasses. This effect revealed the occurrence of a cooperative energy transfer (CET) mechanism in the system, where a Te4+ ion was responsible for the excitation of two Yb3+ ions. The CET efficiency (ηCET) was calculated from the Te4+ lifetime, obtaining a maximum of 74% for the tellurite glass prepared with the highest Yb3+ concentration. The use of thermal lens spectroscopy confirmed the quantum cutting effect, by observing the dependence of the thermal properties of the glass on the Yb3+ concentration. A maximum DC efficiency of 137% was measured for the sample with 4 mol% of Yb3+.