Materials Today Chemistry, Год журнала: 2024, Номер 42, С. 102364 - 102364
Опубликована: Окт. 22, 2024
Язык: Английский
Nature Photonics, Год журнала: 2024, Номер 18(6), С. 562 - 568
Опубликована: Март 1, 2024
Язык: Английский
Процитировано
82
Chemistry of Materials, Год журнала: 2024, Номер 36(9), С. 4654 - 4663
Опубликована: Май 1, 2024
Materials emitting near-infrared (NIR) light play a crucial role in the development of phosphor-converted light-emitting diodes (pc-LEDs) for applications ranging from fundamental science like spectroscopic analysis to highly applied uses night vision and biological imaging. One class materials that has garnered significant interest these technical spaces is Cr3+-activated garnets due their high efficiency ability operate at relatively temperatures. However, limited emission beyond 800 nm impedes use as optimal blue LED-pumped NIR-emitting materials. In this study, we present new garnet-type NIR phosphor, Na2CaZr2Ge3O12:Cr3+, addresses challenge─the material exhibits long-wavelength (λem,max = 832 nm) good thermal quenching resistance while maintaining an excellent internal quantum (IQE 98%). These properties are attributed crystal environment reconstruction, where structure distortion coupled weak field, which uncommon most rigid phosphors. Furthermore, fabricated pc-LED devices using demonstrate superior performance compared with employing well-known efficient phosphors operating range. The source subsequently demonstrated spanning vision, bioimaging, nondestructive analysis. This study not only provides insights into luminescence garnet desirable but also highlights practical application
Язык: Английский
Процитировано
28
Advanced Optical Materials, Год журнала: 2024, Номер 12(16)
Опубликована: Март 14, 2024
Abstract The utilization of phosphor‐converted light‐emitting diodes (pc‐LEDs) as compact short‐wave infrared (SWIR) emitters has emerged a promising strategy for miniature SWIR spectrometers in portable devices, enabling diverse applications such nondestructive identification, bioimaging, night‐vision surveillance, and optical communication. However, discovering phosphors capable efficiently absorbing blue light emitting pure (>900 nm) remains significant challenge. Here, highly efficient thermally stable luminescence Yb 3+ upon LED excitation by employing Cr –Yb energy transfer Y 3 Ga 5 O 12 garnet is reported. prepared :Cr ,Yb phosphor exhibits intense emission spanning from 900 to 1150 nm at 438 excitation, coupled with ultra‐high internal/external quantum efficiency 80.8%/40.2% excellent thermal stability (108%@150 °C). A pc‐LED prototype fabricated incorporating the optimized commercial 450 chip, shows exceptional performance, delivering output power 92.7 mW driving current 350 mA photoelectric 21.5% 10 mA. This work opens up new avenue designing that exhibit photoluminescence demonstrating potential next‐generation high‐power sources.
Язык: Английский
Процитировано
19
Advanced Materials, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 3, 2024
Abstract Ultrabright broadband near‐infrared (NIR) phosphor‐converted laser diode (pc‐LD) as a light source is increasingly essential for improving the sensitivity and spatial resolution of intelligent NIR spectroscopy technologies. However, performance pc‐LD greatly hindered by low external quantum efficiency (EQE) poor thermal resistance phosphor materials. Herein, highly stable phosphor‐in‐ceramic (PiC) film deposited on high conductivity substrate, in which NIR‐emitting Ca 3 MgHfGe O 12 :Cr 3+ incorporated into glass‐crystallized Ga 2 Ge ceramic matrix, along with formation new type PiC composite material efficiency, absorbance, conductivity, designed prepared. The obtained exhibits an impressive EQE 57.7%, 17.1 W m −1 K , wheel demonstrates emission exceeding 5 when excited 450 nm laser. Finally, groundbreaking electrically driven device based achieves 1.6 output, enabling multiple applications archaeology night vision imaging. This work paves way advancing sources diverse range photonic applications.
Язык: Английский
Процитировано
18
Advanced Optical Materials, Год журнала: 2024, Номер 12(13)
Опубликована: Янв. 26, 2024
Abstract Cr 3+ ‐activated near‐infrared (NIR) phosphors have gained extensive attention for use in NIR phosphor‐converted light‐emitting diodes (pc‐LEDs), which are required smart spectroscopy techniques. Nevertheless, obtaining broadband NIR‐emitting with outstanding thermal stabilities and photoluminescence (PL) efficiencies remains a significant challenge. Herein, considering NaSr 2 XGe 5 O 14 (X = Al, Ga, Sc, In) as hosts, possess large band gap multiple sites the substitution of ions. :Cr successfully prepared using solid‐state reaction technology. Upon blue light excitation, cover broad emission 650–1100 nm region. Notably, an abnormal blueshift PL enhancement observed following Al/Ga Sc/In. In particular, internal quantum efficiency is improved from 34.5% (NaSr GaGe : ) to 87.5% ScGe ). Moreover, manufactured pc‐LED exhibited exceptional photoelectric 17.7% output power 10.2 mW at 20 mA, its potential application nondestructive detection demonstrated.
Язык: Английский
Процитировано
16
Laser & Photonics Review, Год журнала: 2023, Номер 18(1)
Опубликована: Окт. 25, 2023
Abstract The burgeoning phosphor‐converted near‐infrared light‐emitting diodes (pc‐NIR LEDs) have important applications in special illumination and spectroscopy analysis. However, the development of efficient NIR‐emitting phosphors with high performance is still a challenge. In this work, chemical unit co‐substitution strategy proposed to realize excitation transition regulation successfully achieve high‐performance NIR luminescence Ca 3‐ y Na Mg 1‐ Sb 2‐ x Al 2+ O 12 : Cr 3+ (0 ≤ 0.05, 0 1) garnet‐type solid solution phosphors. Through modulation from 4 A 2 ground state T 1 ( P) F) state, intensity at blue light region largely enhanced by 25.6 times. Moreover, efficiency thermal stability are improved, optimal internal quantum 90.6% 97%@423 K, without any flux‐assisted sintering or reduction atmosphere protection. structure induced small Stokes shift, weak electron‐phonon coupling effect, decreased non‐radiative responsible for excellent performance. Finally, pc‐LED fabricated photoelectric efficiencies 18.7%@100 mA output powers 63 mW@100 mA, presenting potential nondestructive defect detection, veins imaging, night vision surveillance.
Язык: Английский
Процитировано
33
Advanced Optical Materials, Год журнала: 2023, Номер 12(11)
Опубликована: Дек. 8, 2023
Abstract Cr 3+ ‐doped phosphors are highly recognized in various fields for their remarkable luminous efficiency and spectral flexibility, including modern agriculture horticulture. However, the shortage of suitable far‐red LED devices has inhibited popularization plant lighting. Herein, an innovative phosphor Ca 2 YAl 3 Ge O 12 :Cr (CYAG:Cr ), achieving a broad emission at 770 nm upon 450 blue light excitation is designed. The optimal CYAG:Cr exhibits high internal quantum yield 78.2% low thermal‐quenching behavior 85%@373 K. Thus, fabricated phosphor‐converted LEDs (pc‐LEDs) lighting have output power 33.3 mW photovoltaic conversion 11.5% 100 mA. potential assessed by supplementing Italian lettuce with pc‐LEDs, biomass significantly increased 33%. successful development provides high‐quality option further stimulates new plant‐lighting phosphors.
Язык: Английский
Процитировано
25
Physical Chemistry Chemical Physics, Год журнала: 2023, Номер 25(22), С. 15452 - 15462
Опубликована: Янв. 1, 2023
Broadband near-infrared (NIR) spectroscopy generated from a phosphor-converted light-emitting diode (pc-LED) has multifunctional applications, including food-quality analysis, bio-medical and night-vision, stimulating the demand for developing various NIR phosphors with desired properties. Herein, we selected highly distorted garnet Ca4HfGe3O12 as host explored luminescence of Cr3+. As expected, this material achieved long-wavelength emission excellent absorption efficiency based on effect Jahn-Teller distortion. The synthesized Ca4HfGe3O12:Cr3+ phosphor exhibits broadband peaking at 840 nm full width half maximum 150 nm, reaches 48.0%. However, internal quantum 6 mol% Cr3+-doped sample was measured to be only 35.3% integral intensity 373 K kept 60.1% initial intensity. possible reasons unsatisfactory thermal stability were systematically analyzed, which provided comprehensive understanding relationship between crystal structure luminescent properties Cr3+-activated garnet-type phosphors. Nevertheless, as-prepared pc-LED device output 16.52 mW photoelectric conversion 5.92% driven by 100 mA current, indicating potential application in pc-LED.
Язык: Английский
Процитировано
20
ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(31), С. 41119 - 41126
Опубликована: Июль 29, 2024
Broadband near-infrared (NIR) phosphors are crucial components of NIR phosphor-converted light-emitting diode (pc-LED) sources for various smart spectroscopy applications. However, developing an efficient, tunable, and inexpensive broadband phosphor with sufficient spectral coverage remains a great challenge. In this work, cubic phosphate K2AlTi(PO4)3 highly structural rigidity was chosen as host material Cr3+ substitution to create efficient emission. Synthesizing compound, the obtained exhibits emission covering 700–1200 nm peak wavelength ranging from 820 860 depending on substituting concentration. The concentration optimized sample possesses photoluminescence quantum yield (PLQY) 76.4% centered at 857 full width half-maximum (fwhm) 184 under 464 exaction, demonstrating relatively long-wavelength wide coverage. This is mainly derived single kind center deduced analysis, luminescence dynamics, first-principle calculations. Using material, fabricated pc-LED device presents excellent output power photoelectric conversion efficiency, making attractive in practical applications night-vision bioimaging. Therefore, work not only provides superiorities low cost, high wide-range tunability, coverage, but also highlights some clues discover materials.
Язык: Английский
Процитировано
8
Inorganic Chemistry, Год журнала: 2024, Номер 63(28), С. 12886 - 12893
Опубликована: Июль 1, 2024
Inorganic materials doped with chromium (Cr) ions generate remarkable and adjustable broadband near-infrared (NIR) light, offering promising applications in the fields of imaging night vision technology. However, achieving high efficiency thermal stability these NIR phosphors poses a significant challenge for their practical application. Here, we employ crystal field engineering to modulate characteristics Cr3+-doped Gd3Ga5O12 (GGG). The Gd3MgxGa5–2xGexO12 (GMGG):7.5% Cr3+ (x = 0, 0.05, 0.15, 0.20, 0.40) emission are developed through cosubstitution Mg2+ Ge4+ Ga3+ sites. This strategy also effectively reduces strength around ions, which results enhancement photoluminescence (PL) full width at half-maximum (fwhm) from 97 165 nm, alongside red shift PL peak an intensity up 2.3 times. Notably, behaviors is improved. demonstrate potential biological tissue penetration vision, as well exceptional scintillation performance scintillator imaging. research paves new perspective on development high-performance technology light-emitting diodes (LEDs) X-ray applications.
Язык: Английский
Процитировано
7