Cholesterol-decorated porphyrin with circularly polarized luminescence: Design, synthesis and properties

Journal of Molecular Structure, Journal Year: 2024, Volume and Issue: 1308, P. 138098 - 138098

Published: March 19, 2024

Language: Английский

---

Preparation of a novel violet-excitable Na₃YSi₂O₇:Eu²⁺ green phosphor via salt-flux assistance and its luminescence properties

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(20), P. 7435 - 7445

Published: Jan. 1, 2024

A novel violet-excitable Na 3 YSi 2 O 7 :Eu 2+ green phosphor for a high-quality white LED was developed via salt-flux assistance.

Language: Английский

---

Ni2+ activated broadband near-infrared II germanate phosphor for pc-LED applications

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1003, P. 175743 - 175743

Published: July 29, 2024

Language: Английский

---

Broadband Shortwave Infrared-Emitting Cr³⁺- and Ni²⁺-Codoped Y₃Al₂Ga₃O₁₂ Phosphor with Excellent Thermal Stability for Multifunctional Applications

ACS Applied Materials & Interfaces, Journal Year: 2024, Volume and Issue: 17(1), P. 1509 - 1521

Published: Dec. 20, 2024

Shortwave infrared (SWIR)-emitting materials have emerged as superior light sources with increasing demand for potential applications in noninvasive analysis, night vision illumination, and medical diagnosis. For developing next-generation SWIR phosphor-converted light-emitting diodes (pc-LEDs), the scarcity of intense blue-light-pumped broadband luminescent poor thermal stability current Ni2+-activated phosphors are ongoing challenges. Here, a blue-light-excitable (440 nm) Y3Al2Ga3O12:Cr3+,Ni2+ phosphor ultrawide emission centered at ∼1430 nm (FWHM ∼264 is reported. The efficient Cr3+ → Ni2+ energy transfer exploited remarkable enhancement 18-fold under blue-light excitation. Significantly, excellent (90% 440 K) band obtained codoped which best among reported phosphors. Besides, experimental techniques (XANES EXAFS) density functional theory calculations employed to investigate local structure propose [GaO6] octahedrons favorable occupation sites Ni2+/Cr3+ ions. A pc-LED fabricated using blue chip proof concept invisible illumination technology, nondestructive spectroscopic anticounterfeiting, imaging applications. This work offers effective insights into transfer-assisted presents thermally robust Cr3+-Ni2+-codoped designing future mini-SWIR pc-LEDs spectroscopy

Language: Английский

---

Widened and enhanced near-infrared luminescence of Y2-Sc GaSbO7:Cr3+ phosphors

Journal of Alloys and Compounds, Journal Year: 2023, Volume and Issue: 956, P. 170377 - 170377

Published: May 1, 2023

Language: Английский

---

Sharp-Line Near-Infrared Emission from Tetrahedron-Occupied Ni²⁺ in Ca₂GeO₄

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(33), P. 13370 - 13377

Published: Aug. 10, 2023

As far as we are concerned, the phenomenon of Ni2+ luminescence in tetrahedral coordination has not been reported. For first time, a new NIR phosphor Ca2GeO4:Ni2+ is developed this work. It found that emission from sharp peak attributed to unusual Ni2+-occupied GeO4 site lattice, instead conventional broadband octahedrally coordinated site. Crystal-field analysis applied, and parameters Dq, B, Δ calculated reveal relationship between profile crystal field strength. The optimal doping concentration be 1%. provides an efficient sharp-line (fwhm = 16 nm) centered at 1164 nm which originates 1T2 → 3T1 transition with internal quantum efficiency 23.1% decay lifetime about 300 μs. This work could provide some insights explore novel luminescent materials based on transition-metal elements.

Language: Английский

---

发射峰为875 nm的高热稳定性立方相Sc(PO3)3:Cr3+荧光粉

Science China Materials, Journal Year: 2024, Volume and Issue: 67(3), P. 931 - 938

Published: Feb. 7, 2024

The compact size and high efficiency of near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) make them promising light sources in various fields, such as miniature NIR spectrometer. However, the current state phosphors with emission wavelengths exceeding 850 nm shows poor photoluminescence (PL) thermal stability. In this work, we present cubic-phase Sc(PO3)3:xCr3+ (x = 0, 1, 5, 10, 12, 14, 16 18 at%) that exhibit broadband ranging from 725 to 1150 nm, a peak at 875 nm. Particularly, PL intensity 5 at% sample retains 73.4% its value room temperature when measured 423 K, exhibiting exceptional stability compared previously reported peaks Through comparison investigation on variable-temperature X-ray diffraction patterns cubic- monoclinic-phase Sc(PO3)3:Cr3+ phosphors, it was revealed achieving good phosphor may be attributed minimal bond length angle variations elevated temperatures. fabricated pc-LEDs, driven 150-mA current, produce an radiant flux 26.62 mW. highest electro-optical conversion is 11.87% under drive 10 mA. This work provides insights for discovery Cr3+ ion-doped excellent

Language: Английский

---

Synthesis of SrZnOSe Crystals with Low Phonon Energy for Enhancing Near‐Infrared Mechanoluminescence

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 12, 2024

Near-infrared (NIR) light is promising for bioimaging and information technology due to its high penetration ability resistance interference with environmental radiation. Here, a new class of lanthanide-doped SrZnOSe crystals are developed the self-sustainable generation NIR emissions under mechanical excitation. It shown that render ≈5-fold stronger than well-established CaZnOS low phonon energies selenide host, as confirmed by Raman spectroscopy. The potential utility demonstrated integration mouthguard, which can generate bright bite force transmit encrypted optical signals through thick tissues (up 8 mm) in ambient environments. findings provide powerful addition toolbox self-recovery mechanoluminescent materials open possibilities applied research.

Language: Английский

---

Development of Biocompatible, UV and NIR Excitable Nanoparticles with Multiwavelength Emission and Enhanced Colloidal Stability

ACS Materials Au, Journal Year: 2025, Volume and Issue: 5(2), P. 353 - 364

Published: Jan. 1, 2025

The development of functional nanoprobes for biomedical applications is highly important in the field modern nanotechnology. Due to strict requirements, such as ability be excited using irradiation, which allows deep tissue penetration, nonblinking behavior, and good optical colloidal stability, choice nanoparticles limited, their synthesis challenging. Among all purposes, upconverting nanoparticles, especially those with more complex architectures (e.g., core–shell or core–shell–shell), are most promising candidates. This study demonstrates advanced synthetic routes constructing biocompatible tunable properties stability. core–shell–shell architecture excitation from at least four sources, 272 394 nm near-ultraviolet (near-UV) irradiation 980 808 near-infrared (NIR) lasers. Furthermore, Gd-matrix-based doped lanthanide ions (Nd3+, Yb3+, Tm3+, Eu3+) known paramagnetic magnetic resonance imaging (MRI) well upconversion luminescence diverse emission bands across entire visible spectrum. feature desirable photodynamic therapy applications, proposed could overlap absorption band commonly used photosensitizers potentially result an efficient energy transfer process enhanced generation reactive oxygen species singlet oxygen.

Language: Английский

---

Dual-Emitting Mn4+/Mn5+ in Ba6Na2Nb2P2O17 phosphors for enhanced NIR-I and NIR-II spectroscopy applications

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161131 - 161131

Published: Feb. 1, 2025

Language: Английский

---