Striking Change in Radiative Lifetime and Asymmetry Ratio with Temperature for the Double Perovskite Cs2NaEuCl6

Daiwen Xiao; Hei Yui Kai; Guohua Jia; Ka-Leung Wong; Peter A. Tanner

doi:10.1002/adom.202302261

Striking Change in Radiative Lifetime and Asymmetry Ratio with Temperature for the Double Perovskite Cs₂NaEuCl₆

Daiwen Xiao, Hei Yui Kai, Guohua Jia, Ka-Leung Wong^*, Peter A. Tanner^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

1 Citation (Scopus)

Abstract

The measurement of quantum yield (QY) is an important process for a phosphor. This is often accomplished by the comparison of the low-temperature lifetime with the room temperature (RT) lifetime. It is shown that this procedure provides a considerable underestimation of QY in certain cases. Additionally, the use of the europium ion as an indicator of changes in site symmetry with temperature has severe limitations. This work reveals that a decrease in measured lifetime with increasing temperature of a system cannot always be associated with a descent in site symmetry and may be due to increasing radiative rate.

Original language	English
Article number	2302261
Number of pages	6
Journal	Advanced Optical Materials
Volume	12
Issue number	10
Early online date	23 Nov 2023
DOIs	https://doi.org/10.1002/adom.202302261
Publication status	Published - 4 Apr 2024

Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics

User-Defined Keywords

double perovskite
europium
negative thermal quenching
quantum yield
radiative lifetime

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1002/adom.202302261

Cite this

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title = "Striking Change in Radiative Lifetime and Asymmetry Ratio with Temperature for the Double Perovskite Cs2NaEuCl6",

abstract = "The measurement of quantum yield (QY) is an important process for a phosphor. This is often accomplished by the comparison of the low-temperature lifetime with the room temperature (RT) lifetime. It is shown that this procedure provides a considerable underestimation of QY in certain cases. Additionally, the use of the europium ion as an indicator of changes in site symmetry with temperature has severe limitations. This work reveals that a decrease in measured lifetime with increasing temperature of a system cannot always be associated with a descent in site symmetry and may be due to increasing radiative rate.",

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AU - Xiao, Daiwen

AU - Kai, Hei Yui

AU - Jia, Guohua

AU - Wong, Ka-Leung

AU - Tanner, Peter A.

PY - 2024/4/4

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N2 - The measurement of quantum yield (QY) is an important process for a phosphor. This is often accomplished by the comparison of the low-temperature lifetime with the room temperature (RT) lifetime. It is shown that this procedure provides a considerable underestimation of QY in certain cases. Additionally, the use of the europium ion as an indicator of changes in site symmetry with temperature has severe limitations. This work reveals that a decrease in measured lifetime with increasing temperature of a system cannot always be associated with a descent in site symmetry and may be due to increasing radiative rate.

AB - The measurement of quantum yield (QY) is an important process for a phosphor. This is often accomplished by the comparison of the low-temperature lifetime with the room temperature (RT) lifetime. It is shown that this procedure provides a considerable underestimation of QY in certain cases. Additionally, the use of the europium ion as an indicator of changes in site symmetry with temperature has severe limitations. This work reveals that a decrease in measured lifetime with increasing temperature of a system cannot always be associated with a descent in site symmetry and may be due to increasing radiative rate.

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KW - europium

KW - negative thermal quenching

KW - quantum yield

KW - radiative lifetime

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