Laser-driven broadband near-infrared light source with watt-level output

Nature Photonics, Journal Year: 2024, Volume and Issue: 18(6), P. 562 - 568

Published: March 1, 2024

Language: Английский

---

Valence conversion and site reconstruction in near-infrared-emitting chromium-activated garnet for simultaneous enhancement of quantum efficiency and thermal stability

Light Science & Applications, Journal Year: 2023, Volume and Issue: 12(1)

Published: Oct. 7, 2023

Achievement of high photoluminescence quantum efficiency and thermal stability is challenging for near-infrared (NIR)-emitting phosphors. Here, we designed a "kill two birds with one stone" strategy to simultaneously improve the NIR-emitting Ca3Y2-2x(ZnZr)xGe3O12:Cr garnet system by chemical unit cosubstitution, revealed universal structure-property relationship luminescence optimization mechanism. The cosubstitution [Zn2+-Zr4+] [Y3+-Y3+] played critical role as reductant promote valence transformation from Cr4+ Cr3+, resulting reconstruction octahedral sites Cr3+. introduction also contributed rigid crystal structure. These aspects together realized internal 96% excellent 89%@423 K. Moreover, information encryption "burning after reading" was achieved based on different resistance phosphors acid. developed phosphor-converted light-emitting diode demonstrated promising applications in bio-tissue imaging night vision. This work provides new perspective developing high-performance phosphor materials.

Language: Английский

---

Broadband and Multimode Near‐Infrared Emitter Based on Cr³⁺‐Activated Stannate for Multifunctional Applications

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(7)

Published: Jan. 19, 2023

Abstract Broadband near‐infrared (NIR) phosphors have recently received considerable attention in spectroscopy technology fields, but designing inexpensive, emission peaks centered above 800 nm, and multimodal broadband NIR luminescence material still remains a great challenge. Here, by selecting stannate compound Mg 2 SnO 4 (MSO) as the host, kind of phosphor MSO:Cr 3+ with multimode properties is reported. The designed exhibits an peaking at nm full‐width half maximum 180 (≈2730 cm −1 ). site occupation Cr MSO unraveled density functional theory calculation. constructed light‐emitting device based on displays high output power 187.19 mW@100 mA remarkable photoelectric efficiency 13.67%, its multifunctional applications information encryption, non‐destructive detection, so are also demonstrated. Additionally, through defect reconstruction, presents superior persistent (PersL) PersL duration time longer than 50 h. This work provides feasible strategy to develop intelligent optical integrated low‐cost compounds host toward versatile such detection bioimaging.

Language: Английский

---

Achieving broadband near-infrared emission with superior anti-thermal quenching by optimizing excited-state population of Cr3+ in Gd3ScGa4O12 garnet phosphors

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

Published: Jan. 1, 2024

A record-breaking anti-thermal quenching of broadband NIR emission (198%@543 K) is achieved in a Cr 3+ -activated garnet phosphor via excited-state population optimization.

Language: Английский

---

Simultaneous NIR Emission and Thermal Stability Enhancement in Garnet‐Type NIR Phosphors through the Synergistic Effect of Lattice Distortion and Enhanced Rigidity

Laser & Photonics Review, Journal Year: 2024, Volume and Issue: 18(10)

Published: May 3, 2024

Abstract Even though there have been significant advancements in the development of Cr 3+ ‐activated near‐infrared (NIR) phosphors, challenge still remains to develop highly efficient and thermally stable NIR phosphors. Here, Ca 4‐x Zn x HfGe 3 O 12 :0.03Cr solid solution phosphors with 834–806 nm emission are constructed by substituting 2+ for , thereby facilitating formation [ZnO 6 ] luminescence site. The coexistence [HfO [Zn/CaO centers is confirmed through DFT calculation, time‐resolved photoluminescence (TRPL) spectroscopy, low‐temperature‐photoluminescence (77 K) spectroscopy. effectively resolves issue lattice mismatch between . Furthermore, simultaneous enhancement intensity thermal stability realized a synergistic combination distortion rigidity enhancement. By optimizing substitution concentration internal quantum efficiency (IQE) 92% an external (EQE) 29% finally achieved. Meanwhile, also enhanced from 59%@400 K (x = 0) 81%@400 0.8). developed phosphor‐converted light‐emitting diodes (pc‐LEDs) exhibit promising prospects fields security, biomedicine, non‐destructive testing rapid identification.

Language: Английский

---

Synergy between structural rigidity and cluster defects in a bright near-infrared Cr³⁺-based phosphor for excellent thermal stability and long afterglow

Journal of Materials Chemistry C, Journal Year: 2024, Volume and Issue: 12(26), P. 9716 - 9732

Published: Jan. 1, 2024

This work investigates the important role of structural rigidity and defect related dynamics a promising garnet phosphor with robust thermal stability for efficient NIR pc-LED devices.

Language: Английский

---

Cr3+-doped Na2CaSn2Ge3O12 garnet showing broadband near-infrared emission at 820 nm with zero thermal quenching and near-unity quantum yield

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 499, P. 156274 - 156274

Published: Sept. 30, 2024

Language: Английский

---

Constructing Broadband Near‐Infrared Garnet Emitters CaGd₂Ga₄SiO₁₂:Cr³⁺ with Unity Quantum Efficiency and High Thermal Stability for Versatile Applications

Small, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 4, 2025

Abstract The pursuit of broadband near‐infrared (NIR) phosphors for next‐generation smart NIR light sources has garnered extensive interest. However, developing efficiently excitable by blue to produce thermally stable and highly efficient emission surpassing 830 nm remains a formidable challenge. Herein, novel CaGd 2 Ga 4 SiO 12 garnet is reported, designed through structure reconstruction approach host Cr 3+ ions high‐performance phosphor. By strategically introducing Jahn–Teller distortion at the octahedral sites via chemical pressure, endowed with super‐broadband spanning 600–1300 centered 837 nm. full‐width half maximum (FWHM) varies from 187 223 across doping concentrations, highest internal quantum efficiency (IQE) 99.01%. Remarkable luminescence thermal stability (90.37%@423 K) bolstered weak electron‐phonon coupling (EPC) effect trap‐mediated energy compensation, result heterovalent ion substitutions in dodecahedral tetrahedral sites. Furthermore, prototype phosphor‐converted light‐emitting diode (pc‐LED) fabricated, delivering substantial output power 287.7 mW 1100 mA conversion (PCE) 24.4% 30 mA, enabling impressive performance versatile applications, including component analysis, non‐destructive testing, imaging, night vision.

Language: Английский

---

Tunable Spinel Structure Phosphors: Dynamic Change in Near‐Infrared Windows and Their Applications

Advanced Optical Materials, Journal Year: 2023, Volume and Issue: 11(23)

Published: July 26, 2023

Abstract Applications in near‐infrared (NIR) have been explored significantly many fields, including bioimaging, night vision, plant growth, and chemical analysis. Different emission profiles are required within the same industry. Developing luminescent materials with different tuning methods is reliable for controlling NIR regions (NIR‐I, 700–1000 nm; NIR‐II, 1000–1700 nm). Spinel phosphors promising candidates due to their ability modulate crystal field. Understanding parameters that influence degree of inversion spinel compounds crucial harness variability structure. Cr 3+ Ni 2+ ideal activators NIR‐I NIR‐II emissions, respectively. However, there a need emit region when excited by visible light. Although energy transfer method combining two considered, this review focuses on types structures, discussing common strategies tune host The goal achieve desired shift broadness entire spectrum, highlighting importance spectrum practical applications.

Language: Английский

---

Six- and five-coordinated Cr3+ in Ga2GeO5 invokes tunable broadband near-infrared emission toward night-vision applications

Rare Metals, Journal Year: 2023, Volume and Issue: 42(11), P. 3787 - 3796

Published: Oct. 3, 2023

Language: Английский

---