Development of a potential optical thermometric material through photoluminescence of Pr<sup>3+</sup> in La<sub>2</sub>MgTiO<sub>6</sub>

Journal article (2017)

Authors

Shi Sun Yat-sen University
Lin Sun Yat-sen University
Dorenbos RST/Fundamental Aspects of Materials and Energy - AS
Liang Sun Yat-sen University
Research Group
RST/Fundamental Aspects of Materials and Energy (AS) (TU Delft)
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Published Date

2017

Language

English

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Faculty

Applied Sciences

Department

RST/Radiation, Science and Technology

Research Group

RST/Fundamental Aspects of Materials and Energy

Abstract

In this work, we demonstrate a potential thermometric material after systematic studies on the concentration/temperature-dependent spectroscopic properties of Pr3+ excited multiplets and of the Pr3+-Ti4+ intervalence charge transfer (IVCT) state in (La1-xPrx)2MgTiO6. The experimental results indicate that the electron population efficiency between the involved Pr3+ 4f multiplets is directly governed by multi-phonon relaxation (MPR) and cross relaxation (CR), and the IVCT state provides an additional contribution to the 1D2 luminescence. A schematic energy level diagram is proposed to illustrate the electron population pathway in Pr3+ doped La2MgTiO6. The observations clarify that the dramatic thermal-quenching of 3P0 luminescence is mainly induced by the electronic configuration crossover between the 3P0 multiplet and the IVCT state. On the other hand, the 1D2 luminescence possesses an excellent thermal stability in a large temperature region. These temperature sensing features of the Pr3+ doped La2MgTiO6 material indicate its potential application in optical thermometric techniques.

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