Cr3+ and Yb3+ co-doped perovskite-like phosphor with improved thermal stability by efficient energy transfer

AIP Advances, Journal Year: 2024, Volume and Issue: 14(5)

Published: May 1, 2024

With the development of white light-emitting diode (LED) technology, near-infrared (NIR) phosphor-converted (pc) LED is becoming a new emerging light source. However, due to lack long wavelength components phosphors, application NIR pc-LED restricted. In this work, continuous ultra-broadband emission without gap in 850–950 nm region has been realized Mg4Nb2O9 (MNO):Cr3+, Yb3+ phosphor. Meanwhile, when compared MNO:Cr3+, an improved internal quantum efficiency (from 55.4% 72.6%) and thermal stability 39% 63% at 100 °C) have obtained for Yb3+, which attributed combined effect efficient energy transfer from Cr3+ its nearest unique levels Yb3+. The performances fabricated devices by combining with 460 chips were also given, results demonstrate that phosphor may potential practical pc-LED.

Language: Английский

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Coupling of photoluminescence and flexoelectricity in all-inorganic flexible transparent heterojunctions induced by mechanical strain

Applied Physics Letters, Journal Year: 2025, Volume and Issue: 126(1)

Published: Jan. 2, 2025

Flexible and transparent optoelectronic technology has shown great application prospects in various fields. Introducing rare earth luminescent centers into inorganic ferroelectric systems can benefit the electrical properties by utilizing polar nanodomains brought about doping also facilitate investigation of coupling effect between luminescence modulation flexoelectric effect. This article studies Pr3+-doped barium titanate all-inorganic flexible heterojunctions explores direct fluorescence response through mechanical strain stimulation. We aim to investigate essential correlation physical mechanism strain-flexoelectricity-photoluminescence (force-electric-photon) coupling, providing an important basis for dynamic balance regulation radiative non-radiative transitions. Therefore, this work will significantly promote development highly integrated sensing intelligent devices.

Language: Английский

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Multiple optical thermometry and dynamic anti‐counterfeiting based on multicolor emission in Y₂GaSbO₇:Bi³⁺,Er³⁺ phosphor

Journal of the American Ceramic Society, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 4, 2025

Abstract Optical thermometric and anti‐counterfeiting multifunctional materials hold great promise for practical applications, yet their development continues to encounter considerable challenges. Here, we successfully developed a new Bi 3+ ,Er co‐doped Y 2 GaSbO 7 powder with multicolor luminescence. Through adjusting the excitation wavelengths, emissions in violet, blue, green, orange are achieved. The phosphor demonstrates remarkable thermochromism due distinct temperature‐dependent luminescence of Er , confirmed under irradiation at 312 or 980 nm. By reducing power nm laser increasing laser‐to‐sample distance, emitting color can be precisely tuned from gold‒yellow yellow‒green orange‒red. These diverse luminescent characteristics enable creation multilevel system. Moreover, four‐mode optical thermometry an optimal relative sensitivity 1.98% K −1 high thermal resolution 0.15 K, signal reversibility was established using fluorescence intensity ratio decay time. results disclose that :Bi is promising candidate temperature monitoring dynamic applications.

Language: Английский

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Topological Photoluminescence and Slow Magnetic Relaxation in a Quasi One-Dimensional Stoichiometric Ternary Tb(III) Cyanamide

Chemistry of Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

Technological advances are intangibly linked to the preparation and description of new solid-state materials. Recently, low-dimensional lanthanide-based systems have received particular attention for their interesting magnetic luminescent properties. Thus, motivated by emergence such "NCN" chemistry, we present synthesis stoichiometric Tb(III) cyanamide LixNa1–xTb(NCN)2, which crystallizes in an orthorhombic structure where Tb3+ ions arranged well-separated one-dimensional chains parallel c axis. Luminescence studies show phosphor-like behavior with a process energy migration probed be due large difference size intra- interchain transfer probabilities. As consequence, long lifetime 1.22 ms was observed at 100 K. In contrast, AC susceptibility reveal slow relaxation process, time 4.03 μs, thus establishing good correlation between compound's 1D its This work represents fine example Tb(III)-based compound exhibiting radiative decay.

Language: Английский

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Application of downshifting and antireflection stacked layers synthesized using a wet chemistry method with broad UV excitation for silicon heterojunction solar cells

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 13(5), P. 2356 - 2366

Published: Dec. 9, 2024

Downshifting and antireflection materials enhance the short-circuit current density of solar cell module while reducing ultraviolet degradation in SHJs.

Language: Английский

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Synthesis of new synthetic hybrid glasses using metallic nano-particles and rare-earth: Effect of plasmonic diluents

Ceramics International, Journal Year: 2024, Volume and Issue: 50(21), P. 42340 - 42351

Published: Aug. 5, 2024

Borophosphate-based glass materials have the potential to revolutionize optical technology because of their outstanding properties, long-lasting nature, and cost-effectiveness. The present research addresses intricate functions rare earth metallic nanoparticles (NPs) in borophosphate glass, which significant for photonic medical applications by incorporating Dy3+ ions Cu NPs. We developed novel hybrid glasses through melt-quenching technique, includes creation functional groups establishment bonds between P2O5 B2O3, as confirmed FTIR Raman spectroscopy. UV–visible absorption spectra were used identify presence Cu⁺ (Saeed et al., 2021) [2]⁺ nanoparticles, with peaks indicating respective states. Furthermore, underlying mechanisms energy transfer a matrix that is co-doped dysprosium (Dy3+) been studied. experimental findings this not only provide valuable information about physical properties but also emphasize collaborative relationship rare-earth ion copper nano-powders. Tauc plot analysis demonstrated correlation concentration Dy dopants decrease band gap glass. This suggests these influence electronic structure study opens up possibilities creating innovative customized attributes.

Language: Английский

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Simultaneous influence of rare earth ion doping concentration on radiative and non-radiative transition rates in YVO4: Tm3+

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: unknown, P. 178369 - 178369

Published: Dec. 1, 2024

Language: Английский

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