Defect modulation and luminescence improvement of Mn<sup>4+</sup>-activated La(Mg, Nb)O<sub>3</sub> phosphor with improved stability for plant cultivation

Liu, Quan; Chen, Zhuo; Chen, Xinhe; Chen, Pengyu; Zhu, Yi; Liu, Shuo; Yang, Kai; Wei, Bo; Liu, Zhenyu; Wong, Ka Leung

doi:10.1039/d1tc04992e

Cited by 21 publications

(1 citation statement)

References 39 publications

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“…[ 9 ] The Mn 4+ ‐activated oxides and fluorides usually emit deep‐red light between 650–690 nm. [ 10 ] The Mn 2+ ion is usually octahedrally coordinated in phosphate systems and gives broad‐band red emission owing to the 4 T 1 → 6 A 1 transition. [ 11 ] However, the forbidden 3 d −3 d transitions of Mn 2+ exhibit weak absorption, impeding singly Mn 2+ ‐doped phosphors be efficiently excited by NUV light.…”

Section: Introductionmentioning

confidence: 99%

Luminescence Enhancement of Red‐Emitting Sr₉MnK(PO₄)₇ Phosphor via Energy Transfer and Charge Compensation

Xie

et al. 2022

Physica Status Solidi (b)

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It is an urgent need to explore high‐efficiency and high‐purity red‐emitting phosphors in white light‐emitting diodes (LEDs) application. Herein, the synthesis and luminescence properties of Mn‐based Sr9MnK(PO4)7 phosphor are reported. X‐ray diffraction (XRD) measurement and Rietveld structural refinement confirm that Sr9MnK(PO4)7 is crystallized in the trigonal Sr9Fe1.5(PO4)7 type structure with the space group of R 3 ¯ m (166). Eu2+‐doped Sr9MnK(PO4)7 phosphor exhibits a broad excitation spectrum peaked at 394 nm and emits bright reddish‐orange light centered at 610 nm. Moreover, the introduction of the Ce3+ ion substantially enhances the intensity of Mn2+ emission. Here, Ce3+ acts as a charge compensator rather than a sensitizer, as confirmed by spectral analysis and various chemical techniques. On the base of the energy transfer between Eu2+ and Mn2+ coupled with charge compensation, a high‐brightness red‐emitting Sr9MnK(PO4)7:Eu2+,Ce3+ phosphor is obtained.

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Section: Introductionmentioning

confidence: 99%

Luminescence Enhancement of Red‐Emitting Sr₉MnK(PO₄)₇ Phosphor via Energy Transfer and Charge Compensation

Xie

et al. 2022

Physica Status Solidi (b)

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Efficient Near‐Infrared Luminescence in Cr³⁺ Activated β‐Alumina Structure Phosphor via Multiple‐Sites Occupancy

Li,

Wang,

et al. 2024

Advanced Optical Materials

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Broadband near‐infrared (NIR) phosphors play vital roles in the research and development of compact NIR light sources. Herein, improved NIR luminescence properties have been achieved in β‐alumina structure Ba0.2La0.55Mg0.55Al2.45Ga8O17.25 (BLMAG):Cr3+ phosphor by cation co‐substitution strategy, which controls the local crystal environment for site‐selective occupancy of Cr3+ emitters. With the increase of La3+‐Mg2+ couples in host lattice, the NIR emission peak can be tuned from 712 to 746 nm under 405 nm excitation with a high internal (external) quantum efficiency of 97% (42.6%) and superior thermal stability of 90% @150 °C. The structural refinement and spectral analysis indicate that the broadband NIR emission drives from the Cr3+ occupying multiple luminescence centers in the lattice. Moreover, the as‐prepared phosphor‐converted light‐emitting diode (pc‐LED), using the optimized BLMAG:0.10Cr3+ phosphor, achieves an NIR output power of 72.9 mW at 150 mA with photoelectric conversion efficiency of 15.4%. The spectra well matched to the absorption of photosensitive pigment PFR appear promising in plant growth, the captured doll as well as the penetration experiments also illustrate the application in night vision and biosensing.

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Enhancing negative thermal quenching in green-emitting perovskite microspheres via shallow trap state modulation

Lin,

Huang,

Song

et al. 2024

Sci. China Mater.

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For luminescent materials, negative thermal quenching (NTQ), characterized by an increase in the luminescent intensity with temperature, has a large potential in lighting and display technologies. However, leveraging NTQ in metal halide perovskites is challenging, and the mechanism is not well understood. Herein, by utilizing low-temperature photoluminescence, persistent luminescence and thermoluminescence, the origins of NTQ in CsPbBr3 microspheres are systematically studied, which pertain to the liberation of carriers from shallow trap states. Experimental and theoretical investigations reveal that the energy of these shallow defect states is approximately 0.135 eV beneath the conduction band. A rapid thermal treatment increases the density of these shallow traps and amplifies the NTQ effect, resulting in an enhancement of room-temperature photoluminescence by more than 60% compared to that at 150 K. The process also reduces the threshold for amplified spontaneous emission to about 45 W/cm2. Our findings not only provide a deeper understanding of the NTQ phenomenon in CsPbBr3 microspheres but also open new avenues for enhancing the performance of perovskite optoelectronic devices through energy state regulation.

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Defect modulation and luminescence improvement of Mn⁴⁺-activated La(Mg, Nb)O₃ phosphor with improved stability for plant cultivation

Abstract: The use of Mn4+-activated deep-red phosphors has continued to increase in plant growth lighting.

Cited by 21 publications

References 39 publications

Luminescence Enhancement of Red‐Emitting Sr₉MnK(PO₄)₇ Phosphor via Energy Transfer and Charge Compensation

Luminescence Enhancement of Red‐Emitting Sr₉MnK(PO₄)₇ Phosphor via Energy Transfer and Charge Compensation

Efficient Near‐Infrared Luminescence in Cr³⁺ Activated β‐Alumina Structure Phosphor via Multiple‐Sites Occupancy

Enhancing negative thermal quenching in green-emitting perovskite microspheres via shallow trap state modulation

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Defect modulation and luminescence improvement of Mn4+-activated La(Mg, Nb)O3 phosphor with improved stability for plant cultivation

Abstract: The use of Mn4+-activated deep-red phosphors has continued to increase in plant growth lighting.

Cited by 21 publications

References 39 publications

Luminescence Enhancement of Red‐Emitting Sr9MnK(PO4)7 Phosphor via Energy Transfer and Charge Compensation

Luminescence Enhancement of Red‐Emitting Sr9MnK(PO4)7 Phosphor via Energy Transfer and Charge Compensation

Efficient Near‐Infrared Luminescence in Cr3+ Activated β‐Alumina Structure Phosphor via Multiple‐Sites Occupancy

Enhancing negative thermal quenching in green-emitting perovskite microspheres via shallow trap state modulation

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Product

Resources

About

Defect modulation and luminescence improvement of Mn⁴⁺-activated La(Mg, Nb)O₃ phosphor with improved stability for plant cultivation

Luminescence Enhancement of Red‐Emitting Sr₉MnK(PO₄)₇ Phosphor via Energy Transfer and Charge Compensation

Luminescence Enhancement of Red‐Emitting Sr₉MnK(PO₄)₇ Phosphor via Energy Transfer and Charge Compensation

Efficient Near‐Infrared Luminescence in Cr³⁺ Activated β‐Alumina Structure Phosphor via Multiple‐Sites Occupancy