Ceramics International, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 1, 2024
Язык: Английский
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(17)
Опубликована: Март 2, 2024
Abstract The near‐infrared (NIR) persistent luminescence (PersL) materials have attracted widespread attention owing to the unique self‐sustained light with good penetrability. Currently, most of reported NIR PersL are activated by Cr 3+ . Considering potential toxicity chromium ions, there is an urgent requirement explore ‐free phosphors. Herein, a novel phosphor Sr 2 LuSbO 6 :Fe (SLSO:Fe ) prepared and its properties systematically studied. Fe ‐activated exhibits long‐wavelength emission band centered at 890 nm 110 full‐width half maximum (FWHM), can last over 18 h. shows excellent stability even after being dispersed in solutions different environments for 7 days. Furthermore, emitted penetrate cm thickness beef, evidencing penetration property. This work provides based on technological applications also contributes accelerate development new‐generation ‐doped toward versatile applications.
Язык: Английский
Процитировано
20
Laser & Photonics Review, Год журнала: 2024, Номер 18(5)
Опубликована: Янв. 8, 2024
Abstract Near‐infrared (NIR) light sources have gained immense popularity in recent years due to their wide range of applications various fields, including spectroscopy and biomedical imaging. However, the limited emission bandwidth NIR phosphors is a significant bottleneck development. Here, novel strategy reported broaden by awakening dumb site. Na 4 M 3 Ta(PO ) 6 : Cr 3+ ( = Al , Ga In phosphor synthesized, which exhibits greatly broadened from 134 232 nm. Structural spectral analysis reveals that NaO octahedral site has severe t 2g ‐type distortion, making it for . By introducing larger at site, angular distortion decreases normal range, enabling luminescence again. Along with bandwidth, peak also redshifts 802 977 nm, giving advantages applications. Interestingly, awakened shows even better properties than original M/TaO These findings reveal insight into could potentially revolutionize design phosphors.
Язык: Английский
Процитировано
16
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
Advanced Optical Materials, Год журнала: 2023, Номер 12(4)
Опубликована: Авг. 31, 2023
Abstract Near‐infrared (NIR) phosphors are enablers for NIR phosphor‐converted light‐emitting diodes (pc‐LEDs). However, fewer NIR‐emitting with both high internal/external quantum efficiency (IQE/EQE) and thermal stability discovered, which obstructs the promotion of pc‐LEDs. Herein, by partially replacing Al 3+ in K‐β‐Al 2 O 3 :2Cr Ga , photoluminescence (PL) intensity solid solution K 1+δ (Al 0.4 0.6 ) 11 17 (KA G O:Cr) phosphor is increased 2.75 1.25 times that end‐members (KAO:Cr) (KGO:Cr). The IQE/EQE optimal KA O:Cr reaches 88.9%/50.8% (77.4%@150 °C). PL enhancement due to Al/Ga‐6O octahedral volume distortion variation caused substitution 1‐y ,Ga y O:Cr), leads forbidden d–d transition being broken crystal field strength varied. Finally, a pc‐LED device fabricated based on blue chip an electro‐optical 16.3% under drive current 100 mA. Meanwhile, non‐destructive detection plant germination applications demonstrated. These results prove promising diverse applications.
Язык: Английский
Процитировано
23
Journal of Advanced Ceramics, Год журнала: 2024, Номер 13(3), С. 354 - 363
Опубликована: Янв. 29, 2024
Near-infrared (NIR) phosphor-converted light-emitting diodes/laser diodes (LEDs/LDs) are prospective lighting sources for NIR spectroscopy. However, developing a phosphor material with desired thermal robustness and high photoelectric efficiency is crucial challenge its applications. In this work, based on the cationic radius matching effect, series of (Lu,Y)3(Al,Sc,Cr)2Al3O12 ceramics (LuYScCr NIR-PCs) were fabricated via vacuum sintering. An excellent stability (95%@150 oC) was obtained in prepared NIR-PC, owing to weak electron phonon coupling effect (small Huang Rhys factor). Being excited at 460 nm, NIR-PCs realized broadband emission (650-850 nm) an IQE 60.68 %. Combining LED/LD chips, maximum output power encapsulated LED prototype 447 mW @ 300 mA as 18.6 % 180 mA, LD 814mW 2.5 A. The working temperatures 70.8 oC (LED) 102.8 3 A (LD), respectively. Finally, applied food detection verified study, demonstrating anticipated application prospects future.
Язык: Английский
Процитировано
14
Inorganic Chemistry, Год журнала: 2024, Номер 63(5), С. 2655 - 2662
Опубликована: Янв. 22, 2024
In an increasing manner, near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are considered to be exemplary light sources owing their notable attributes of elevated output power, economical nature, and exceptional portability. NIR phosphors critical components pc-LEDs. Herein, we report a novel blue excitable phosphor CaLu2ZrScAl3O12:Cr3+ (CLZSA:Cr3+) as crucial efficient broadband emitter. The CLZSA:Cr3+ displays intense emission peaking at 776 nm with full width half-maximum (fwhm) 140 nm. designed material also exhibits superior resistance thermal quenching, the intensity 423 K remains 80% that room temperature. constructed pc-LED device based on demonstrates high total power 68.4 mW drive current 100 mA, along photoelectric conversion efficiency 23.0%. Impressively, high-power pc-LEDs utilized for remote control non-invasive detection, resulting in excellent performance remarkable achievement.
Язык: Английский
Процитировано
10
Chemical Engineering Journal, Год журнала: 2024, Номер 488, С. 150980 - 150980
Опубликована: Апрель 3, 2024
Язык: Английский
Процитировано
10
Journal of Materials Chemistry C, Год журнала: 2024, Номер 12(10), С. 3654 - 3661
Опубликована: Янв. 1, 2024
The prepared MGO:Cr 3+ phosphor has dual-mode emissions for sensing, including NIR photoluminescence and mechanoluminescence. Moreover, the developed light-emitting device functions of anti-counterfeiting biological tissue penetration.
Язык: Английский
Процитировано
9
Ceramics International, Год журнала: 2025, Номер unknown
Опубликована: Фев. 1, 2025
Язык: Английский
Процитировано
1