Achievement of high photoluminescence quantum yield orange-red phosphors by designing Eu2+ reduction environment for multi applications

Li, Xiaojie; Li, Panlai; Feng, Xiuxiu; Ding, Wenge; Liu, Mengdi; Yan, Zekang; Guo, Dongxu; Gong, Jie; Zhang, Ting; Wang, Zhijun

doi:10.1016/j.ceramint.2023.12.339

Ceramics International

2024

DOI: 10.1016/j.ceramint.2023.12.339

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Achievement of high photoluminescence quantum yield orange-red phosphors by designing Eu2+ reduction environment for multi applications

Xiaojie Li,

Panlai Li,

Xiuxiu Feng

et al.

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2024

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Cited by 2 publications

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Unlocking Chlorine Oxide‐Based Ultra‐Wideband Near‐Infrared Phosphor and Advancing Spectral Performance via Lattice Engineering

Zhao,

Xia,

et al. 2024

Adv Funct Materials

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Near‐infrared (NIR) phosphor‐converted light–emitting diodes (pc‐LEDs) are increasingly used in night vision, surveillance, and biomedicine. A major challenge is to identify a phosphor that efficiently converts blue light into wideband NIR emission. In this paper, a rare‐earth divalent europium (Eu2+)‐activated halogen oxide (Sr3GeO4Cl2) phosphor is unlocked via a high‐temperature solid‐state reaction. The Sr3GeO4Cl2:Eu2+ phosphor emits a wide spectrum (500–950 nm) with a peak at 700 nm when excited by 450 nm blue light. Extended X‐ray absorption fine structure (EXAFS) analysis reveals that the NIR emission primarily originates from Eu2+ ions, and the Eu─O bond length closely resembles the Sr─O bond length. Lattice engineering, specifically Ge/Si cation substitution, increased Eu2+ incorporation into the crystal lattice, boosting luminescence intensity by 75%–122% and quantum efficiency from 15% to 26%. This is related to the combined effect of reduced non‐radiative energy transfer and changes in the local lattice structure of Eu2+. A NIR pc‐LED device using the optimized phosphor showed a photoelectric efficiency of 16.5% and an optical output of 25.07 mW at 100 mA. This study not only explores new Eu2+‐activated NIR phosphors but also highlights the importance of crystal engineering to enhance luminescence properties, guiding future research for efficient NIR pc‐LED development.

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Unlocking Chlorine Oxide‐Based Ultra‐Wideband Near‐Infrared Phosphor and Advancing Spectral Performance via Lattice Engineering

Zhao,

Xia,

et al. 2024

Adv Funct Materials

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A novel orange-red emitting K5Y(MoO4)4:Sm3+ phosphor with excellent color purity for temperature sensing and high CRI WLEDs

Li,

Cheng,

Ran

et al. 2024

Journal of Luminescence

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Achievement of high photoluminescence quantum yield orange-red phosphors by designing Eu2+ reduction environment for multi applications

Cited by 2 publications

References 30 publications

Unlocking Chlorine Oxide‐Based Ultra‐Wideband Near‐Infrared Phosphor and Advancing Spectral Performance via Lattice Engineering

Unlocking Chlorine Oxide‐Based Ultra‐Wideband Near‐Infrared Phosphor and Advancing Spectral Performance via Lattice Engineering

A novel orange-red emitting K5Y(MoO4)4:Sm3+ phosphor with excellent color purity for temperature sensing and high CRI WLEDs

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