Strong green upconversion emission in ZrO2:Yb3+–Ho3+ nanocrystals

Citations Over TimeTop 10% of 2005 papers

Abstract

Structural and upconversion emission properties of ZrO2:Yb3+–Ho3+ nanocrystals were analyzed as function of Yb3+ concentration. Structural characterization shows a crystallite size up to 80 nm and tetragonal and cubic phase as the main crystalline structures. Strong green (540 nm) and weak red (670 nm) and near infrared (760 nm) emission bands were observed with 968 nm excitation. The upconversion is based on two photons absorption either by the energy transfers from Yb3+ ion or by the excited state absorption. The energy transfer efficiency was calculated to be 50% for 2 mol % of Yb3+ diminishing to less than 20% for higher concentration. The Yb3+ concentration also affects the decay time of the green emission of Ho3+ ion diminishing from 140μs for 2 mol % of Yb to 76μs for higher concentration.

Related Papers

• → Molecular light-upconversion: we have had a problem! When excited state absorption (ESA) overcomes energy transfer upconversion (ETU) in Cr(iii)/Er(iii) complexes(2021)38 cited
• → Effect of excitation energy on non-thermally coupled temperature sensing of NaGdF4:Yb3+/Er3+ upconversion nanocrystals(2022)12 cited
• → Ultraviolet emissions from Gd^3+ ions excited by energy transfer from pairs of photoexcited Er^3+ ions: upconversion luminescence from CsMgCl_3 crystals doped with Gd^3+ and Er3+(1994)27 cited
• → Controllable synthesis of tetragonal LiScF4:Yb3+, Er3+ nanocrystals and its upconversion photoluminescence properties(2016)7 cited
• → Dynamics of up-conversion for photoexcited pairs of Er3+ ions in CsCdBr3 crystals(1990)18 cited