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Novel rare-earth (RE; e.g., europium (Eu3+), samarium (Sm3+), and praseodymium (Pr3+)) and transition metal (TM4+; e.g., manganese (Mn4+)) ion single-/co-doped double-perovskite Ca2InTaO6 (CITO) phosphors were prepared and investigated with respect to their crystal structure and photoluminescence (PL) properties. Among them, the CITO:Eu3+ phosphors were found to exhibit an ultra-high internal PL quantum yield (89.1%) and good thermal stability (78.7% at 423 K relative to the initial value at 303 K). As such, the corresponding packaged white light-emitting diode (LED) was able to display a remarkable color rendering index (CRI; = 91.51@10 mA). Besides, the potential in applications of anti-counterfeiting fields and a novel LED structure based on flexible phosphor-converted films was also studied. Moreover, due to their different thermal quenching, trivalent lanthanide (Ln3+)/Mn4+ co-doped CITO phosphors were designed for optical thermometry based on the luminescence intensity ratio (LIR) between different 4f transitions of various Ln3+ ions and 2Eg4A2g (Mn4+) transition. Particularly, the LIR between the 4G5/26H9/2 and 2Eg4A2g peaks of the CITO activated with 5 mol% Sm3+ and 0.3 mol% Mn4+ exhibited the most excellent relative sensitivity (Sr; = 3.80 %·K−1) with beneficial temperature uncertainty of 0.0648 K. Overall, these results are of significance to offer valuable databases for constructing multifunctional high-performance optical platforms using single-/co-doped double-perovskite tantalates.


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Rare-earth and transition metal ion single-/co-doped double-perovskite tantalate phosphors: Validation of suitability for versatile applications

Show Author's information Yongbin HuaaJae Su Yua( )Li Lib( )
Department of Electronics and Information Convergence Engineering, Institute for Wearable Convergence Electronics, Kyung Hee University, Yongin-si 17104, Republic of Korea
School of Science, Chongqing University of Posts and Telecommunications, Chongqing 400065, China

Abstract

Novel rare-earth (RE; e.g., europium (Eu3+), samarium (Sm3+), and praseodymium (Pr3+)) and transition metal (TM4+; e.g., manganese (Mn4+)) ion single-/co-doped double-perovskite Ca2InTaO6 (CITO) phosphors were prepared and investigated with respect to their crystal structure and photoluminescence (PL) properties. Among them, the CITO:Eu3+ phosphors were found to exhibit an ultra-high internal PL quantum yield (89.1%) and good thermal stability (78.7% at 423 K relative to the initial value at 303 K). As such, the corresponding packaged white light-emitting diode (LED) was able to display a remarkable color rendering index (CRI; = 91.51@10 mA). Besides, the potential in applications of anti-counterfeiting fields and a novel LED structure based on flexible phosphor-converted films was also studied. Moreover, due to their different thermal quenching, trivalent lanthanide (Ln3+)/Mn4+ co-doped CITO phosphors were designed for optical thermometry based on the luminescence intensity ratio (LIR) between different 4f transitions of various Ln3+ ions and 2Eg4A2g (Mn4+) transition. Particularly, the LIR between the 4G5/26H9/2 and 2Eg4A2g peaks of the CITO activated with 5 mol% Sm3+ and 0.3 mol% Mn4+ exhibited the most excellent relative sensitivity (Sr; = 3.80 %·K−1) with beneficial temperature uncertainty of 0.0648 K. Overall, these results are of significance to offer valuable databases for constructing multifunctional high-performance optical platforms using single-/co-doped double-perovskite tantalates.

Keywords: anti-counterfeiting, phosphors, thermometry, quantum yields (QYs), light-emitting diodes (LEDs)

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Received: 24 November 2022
Revised: 07 February 2023
Accepted: 12 February 2023
Published: 11 April 2023
Issue date: May 2023

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© The Author(s) 2023.

Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (No. 2018R1A6A1A03025708).

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