Опубликована: Янв. 1, 2025
Язык: Английский
Advanced Functional Materials, Год журнала: 2024, Номер 34(36)
Опубликована: Март 17, 2024
Abstract Next‐generation high‐brightness lighting faces a big challenge in developing laser‐drivable color‐converting materials with effective thermal management. Herein, new material architecture of Al 2 O 3 ‐Y 5 12 : Ce 3+ (YAG: Ce) transparent composite ceramics coated film (TCC@Al) is proposed. The as‐prepared shows the highest conductivity (29.3 W m −1 K ) among YAG: Ce‐related (TC) ever reported owing to combination role short‐range conduction microcrystals and long‐range film. Temperature‐dependent photoluminescence (PL) spectra femtosecond transient absorption (fs‐TA) evidence importance management, whereby luminescent loss TCC@Al only 8.92% at 450 far smaller than TC counterpart (15.86%). Importantly, no obvious luminescence saturation detected upon 20 mm −2 blue laser irradiation inhomogeneous angular color distribution suppressed by scatter microcrystals, yielding uniform white light ultra‐high luminous flux (LF) 4294 lm@20 efficacy (LE) 215 lm . As consequence, present TCC@Al‐converted laser‐driven prototype exhibits much better optical performance commercial TC‐based one.
Язык: Английский
Процитировано
35
Advanced Materials, Год журнала: 2024, Номер unknown
Опубликована: Июнь 26, 2024
High-brightness laser lighting is confronted with crucial challenges in developing laser-excitable color converting materials effective heat dissipation and super optical performance. Herein, a novel composite of phosphor-in-glass film on transparent diamond (PiGF@diamond) designed fabricated via facile low-temperature co-sintering strategy. The as-prepared La
Язык: Английский
Процитировано
33
ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(42), С. 57365 - 57376
Опубликована: Окт. 12, 2024
Efficient blue-light-excitable broadband cyan-emitting phosphors may yield full-visible-spectrum white light-emitting diodes (WLEDs) with ultrahigh color rendering (Ra > 95). However, this requires closing the "cyan gap" in 480–520 nm region of visible spectrum, which is challenging. Herein, a well-performed garnet phosphor Ca2LuAlGa2Si2O12:Ce3+ (CLAGSO:Ce3+) reported. Under 430 excitation, optimal CLAGSO:5%Ce3+ compound exhibits cyan emission (peak, 496 nm; bandwidth, 102 nm) high internal quantum efficiency 85.6% and an excellent thermal resistance performance (69.1% at 423 K). Importantly, as-prepared provides sufficient enables filling well-known so-called between blue LED chip commercial Y3Al5O12:Ce3+ (YAG:Ce3+) yellow phosphor. Impressively, WLED device fabricated sample shows low correlated temperature (4053 K) index = 96.6), as well luminous efficacy (74.09 lm W–1). These results highlight importance blue-excited gap enabling human-centric warm devices for high-quality solid-state lighting.
Язык: Английский
Процитировано
27
Laser & Photonics Review, Год журнала: 2024, Номер 18(10)
Опубликована: Май 2, 2024
Abstract Eu 2+ ‐doped phosphors have attracted the great attention of researchers in past decade. However, dopant inorganic hosts often suffers from self‐oxidation effect, therefore causing attenuated emission intensity and quantum efficiency. In this regard, developing doped with prohibited effect increased thermal stability is urgently required. Herein, an innovative cyan‐light emitting Li 2 CaSiO 4 :Eu /Eu 3+ , Lu (LCSO) phosphor designed. Both experimental results theoretical calculations demonstrate that adding restricts into thus improving . Meanwhile, introduction brings out excellent stability. Finally, efficient WLED a color temperature (CCT) 4573 K high rendering index (R ) 84.2 obtained using as‐prepared due to perfect compensation cyan light. As improves much greater difference PL decay rate between LCSO reached, thereby their sensitivity sensing. The strategy for prohibiting stable may stimulate some new ideas designing high‐performance more diverse applications.
Язык: Английский
Процитировано
19
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
Journal of Material Science and Technology, Год журнала: 2024, Номер 210, С. 179 - 187
Опубликована: Июнь 5, 2024
Язык: Английский
Процитировано
11
Advanced Functional Materials, Год журнала: 2024, Номер unknown
Опубликована: Окт. 24, 2024
Abstract Next‐generation high‐brightness laser lighting confronts a key challenge in preparing static color‐converting materials with remarkable luminescence saturation. Herein, novel architecture of transmissive Y 3 Al 5 O 12 : Ce 3+ (YAG) phosphor‐in‐glass film (PiGF) double‐sided sapphires, i.e., sandwich structured sapphire@PiGF@sapphire (S@PiGF@S) composite, is designed and fabricated by thermocompression sintering technology. This kind material can tolerate high power density (LPD) for the efficient thermal channels high‐energy spot away from PiGF emitting layer. As consequence, optimized S@PiGF@S color converter yields white light luminous flux (LF) 7602 lm at record saturation threshold 46.47 W·mm −2 benefiting its low working temperature merely 284 °C, which 6.3 times that traditional PiGF@sapphire (1205 [email protected] ). These findings verify developed enables preferably optical‐thermal performances promising applications lighting.
Язык: Английский
Процитировано
9
Optics Express, Год журнала: 2024, Номер 32(2), С. 2644 - 2644
Опубликована: Янв. 3, 2024
Lu
Язык: Английский
Процитировано
8
Ceramics International, Год журнала: 2024, Номер unknown
Опубликована: Ноя. 1, 2024
Язык: Английский
Процитировано
8
Laser & Photonics Review, Год журнала: 2024, Номер unknown
Опубликована: Окт. 23, 2024
Abstract Phosphor‐converted laser lighting confronts enormous challenges in the development of color converters with high luminescence saturation owing to thermal issues from irradiation and phosphor conversion. Herein, a Y 3 Al 5 O 12 : Ce 3+ ‐diamond (YAG‐diamond) composite converter by introducing diamond particles phosphor‐in‐glass film (PiGF) coated on transparent sapphire substrate is proposed for high‐brightness laser‐driven white lighting. By optimizing content 6 wt.%, YAG‐diamond shows conductivity (TC) 14.7 W·m −1 ·K displays higher intensity at 175 °C (1.15 times that 25 °C). Under excitation, achieves luminous flux (LF) 1990 lm power density (LPD) threshold (ST) 24.82 W·mm −2 , which far better than PiGF@sapphire LF 1364 [email protected] . The yields stable light correlated temperature (CCT) 5714 K chromaticity coordinate (0.3278, 0.3372) ST Furthermore, working decreased 59 (26.6%) under LPD 10.89 These results indicate excellent opto‐thermal performances, may be promising material
Язык: Английский
Процитировано
7