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High Power Laser‐Driven Ce <sup>3+</sup> ‐Doped Yttrium Aluminum Garnet Phosphor Incorporated Sapphire Disc for Outstanding White Light Conversion Efficiency
摘要： A facile synthesis method for the development of Y3 (cid:2) xAl5O12:xCe3t (0.03–0.24) yellow phosphor via an auto-combustion method and fabrication of phosphor-incorporated sapphire disc (PISD) of various dimensions is reported. The photoluminescence (PL) intensity for the optimized concentration of Ce3t-doped yttrium aluminum garnet (YAG) phosphor is recorded at 550 nm wavelength under the excitation wavelength of 445 nm from a high power blue laser diode. The developed PISD exhibits high stability and luminescence. The blue laser diode is a promising candidate to revolutionize the luminous intensity of the white light by several orders of magnitude as compared with the existing blue light-emitting diodes. This emerging technology has an extremely bright future with endless uses of tunable power of the laser that controls the intensity of the emitted white light. Hence, this new approach provides a paradigm shift to produce highly ef?cient white light based on PISD integrated with blue laser diode as compared with the conventional technology. Moreover, such con?gurations allow more styling and packaging ?exibility that reduces the overall size of the fabricated unit and makes it favorable for various lighting applications.
关键词： blue laser diodes,photoluminescence,optical geometry,white light conversion,yellow phosphor
更新于2025-11-21 11:18:25
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Assembly of shell/core CDs@CaF2 nanocomposites to endow polymer with multifunctional properties
摘要： Assembly of shell/core CDs@CaF2 nanocomposites to endow polymer with multifunctional properties. The shell/core structure of CDs@CaF2 nanocomposites (CCNCs) were prepared by assembling fluorescent carbon dots (CDs) inside the inorganic CaF2 substrates using co-precipitation interaction. CDs endow the CaF2 with the properties of good UV-absorbing behavior and efficient blue light emission instead of rare earth such as Eu that is expensive and susceptible to polluting environment during the mining process. Due to nanometer size and surface effect of nano CaF2, and approximate refractive index between CaF2 and polyethylene (PE), CCNCs/PE film exhibits better elongation at break than pure PE film while maintaining high transparency and visible light transmittance. Simultaneously, the CCNCs/PE film was experimentally demonstrated to have outstanding performance of anti-UV and blue light conversion, which decide that CCNCs can be a novel and promising multifunctional additive applied in polymers especially for greenhouse film.
关键词： CaF2,Carbon dots,Polymer,Light conversion,Anti-UV,Nano-toughening
更新于2025-09-23 15:23:52
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Bio-mimic energy storage system with solar light conversion to hydrogen by combination of photovoltaic devices and electrochemical cells inspired by the antenna-associated photosystem II
摘要： Global warming caused by anthropogenic activity is one of the serious problems today. In order to suppress the global warming, the shift from fossil fuel–based energy source to the nature-oriented sustainable energy is encouraged. In this concept paper, possible biomimetic engineering approach inspired by the efficient and sustainable natural energy utilization in living plants is demonstrated. The focal features in plants include (1) the light-harvesting and energy condensing apparatus, (2) water splitting O2 evolving apparatus, (3) storage of energy-related chemicals, and (4) reversal conversion of storage into the “energy in use” by meeting the demands. Demonstration of solar-driven chemical energy conversion was performed using a system consisted of (i) photovoltaic power-generating device, (ii) an electrochemical unit converting electric power into chemical energy, (iii) storage of H2, and (iv) polymer electrolyte cells converting H2 back to electricity by meeting the demands on site. The present concept paper presenting a technical perspective based on the plant-inspired knowledge (conceptual similarity between natural photosynthesis and solar-to-H2 conversion) is a fruit of interdisciplinary collaboration between the team of chemical energy conversion renown for the world highest record of solar-to-hydrogen conversion efficiency (24.4%, as of 2015) and a group of plant biologists.
关键词： energy system,hydrogen,Photosystem-II,solar light conversion
更新于2025-09-23 15:19:57
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Effects of Hexagonal Boron Nitride Sheets on the Optothermal Performances of Quantum Dots-Converted White LEDs
摘要： Recently, quantum dots-converted white light-emitting diodes (QDs-WLEDs) are attracting numerous attention due to their high luminous efficiency and excellent color quality. As for color conversion material, the quantum dots (QDs) are commonly embedded into a low-thermal-conductivity polymer matrix. In this case, their generated heat during the photoluminescence process can hardly be dissipated into the heat sink, leading to a high working temperature and reduced lifetime. Adding particles with high thermal conductivity to the QDs layer can enhance its thermal conductivity, and thus reduce QDs’ working temperature. At the same time, these particles may affect the optical properties of QDs. However, this problem has still not been deeply studied. In this article, we systematically investigated the effects of the highly thermal-conductive hexagonal boron nitride sheets (hBNSs) on the optothermal performances of QDs/phosphor film in white light-emitting diodes (WLEDs). The thermal conductivity of QDs/phosphor film was significantly increased by 24% after adding 5wt% of 45-μm-diameter hBNS. As for the optical performance, the transparency of the silicone gel film with 45-μm-diameter hBNS was much better than that with 6–9-μm-diameter hBNS under the same weight fraction. Furthermore, the scattering effect of hBNS plays a more important role in enhancing the light conversion performance of QDs than that of phosphor. At last, a color stability test showed the increasing rate of correlated color temperature (IRCCT) of hBNS-added WLEDs are 21% smaller than that of common WLEDs after working 153 h, meaning a better QDs stability in hBNS-added WLEDs.
关键词： light conversion,quantum dots (QDs),Hexagonal boron nitride sheets (hBNSs),thermal conductivity
更新于2025-09-11 14:15:04
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Exploration of highly efficient blue-violet light conversion agents for agricultural film based on structure optimization of TPA
摘要： To obtain highly efficient blue-violet light conversion agents used for agricultural film, six triarylacrylonitrile derivatives and their doping films were prepared. Further, the luminogens have the ability to convert UV light into blue-violet light, and exhibit aggregation dependent fluorescence emission and high-contrast fluorescence quantum yields from 0.004 to 0.833. Based on X-ray single crystal diffraction analysis and aggregation-induced emission activity tests, the variant fluorescence quantum yields are attributed to intermolecular π-π stacking and phase transition between crystalline state and amorphous state. In simulated greenhouse environment, the luminogens exhibit excellent photostability. However, their fluorescence intensity drop to 17%-40% of prime intensity after outdoor radiation for one month due to the ring-closing oxidation reaction (In summer). By comprehensively considering the above photophysical properties and mechanical properties of the doping film, Ph4TPA is a potential light conversion agent for agricultural film in winter. More importantly, the results indicate the properties of the light conversion films are expected to be further improved by molecular design inhibiting the ring-closing oxidation reaction and dispersion of crystalline nanoparticles in the doping film.
关键词： Light conversion film,Light conversion agents,Fluorescence,Photosynthesis,Acrylonitrile derivatives
更新于2025-09-09 09:28:46