Advanced Optical Materials
·
2024
·
IF 8
Ziqiang Tian,Jinyao Zhu,Qilin Guo,Lulu Chen,Jia Guo,Changchun Wang
Photonic crystals (PCs) with unique light manipulation capability have attracted widespread attentions. However, weak photonic bandgaps, poor structural color saturation, and tedious preparation process restrict their further development and practical application. Herein, an ultra-bright stimuli-responsive PC film with excellent optical performance is prepared by assembly of cadmium sulfide@polyacrylic acid (CdS@PAA) core–shell nanoparticles into PCs through molecule-mediated shearing-induced assembly technique (MSAT), this fabrication process is fast and facile, the solid periodic micro/nano-structures can be formed within 10 s, and a wide selection range of structural color can be obtained. The high refractive index of CdS guarantees high brightness of the PC films. The prerequisite of using MSAT for preparation of large-sized ultra-bright PC film is that the CdS@PAA nanoparticles possess appropriate thickness of PAA shell. Compared with conventional PCs, the ultra-bright PC films present strong photonic bandgaps and high structural color saturation, the relative reflectance is up to 130% compared with a standard aluminum mirror, which is more than four times reflectivity of PS@PAA microspheres. In addition, the PC paint is prepared by mashing the ultra-bright PC film and blending it with transparent polydimethylsiloxane (PDMS) matrix, the PC coating prepared by alkali treated ultra-bright PC pigments can achieve good water response ability and anticounterfeiting effect.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Light-Science & Applications
·
2022
·Vol. 11
·期 1
·1-12
·
IF 20.257
Zhang Yan,Miao Shihai,Liang Yanjie,Liang Chao,Chen Dongxun,Shan Xihui,Sun Kangning,Wang Xiao-Jun
The growing demand for spectroscopy applications in the areas of agriculture, retail and healthcare has led to extensive research on infrared light sources. The ability of phosphors to absorb blue light from commercial LED and convert the excitation energy into long-wavelength infrared luminescence is crucial for the design of cost-effective and high-performance phosphor-converted infrared LEDs. However, the lack of ideal blue-pumped short-wave infrared (SWIR) phosphors with an emission peak longer than 900 nm greatly limits the development of SWIR LEDs using light converter technology. Here we have developed a series of SWIR-emitting materials with high luminescence efficiency and excellent thermal stability by co-doping Cr 3+ -Yb 3+ ion pairs into Lu 0.2 Sc 0.8 BO 3 host materials. Benefitting from strong light absorption of Cr 3+ in the blue waveband and very efficient Cr 3+ →Yb 3+ energy transfer, the as-synthesized Lu 0.2 Sc 0.8 BO 3 :Cr 3+ ,Yb 3+ phosphor emits intense SWIR light in the 900–1200 nm from Yb 3+ under excitation with blue light at ~460 nm. The optimized phosphor presents an internal quantum yield of 73.6% and the SWIR luminescence intensity at 100 °C can still keep 88.4% of the starting value at 25 °C. SWIR LED prototype device based on Lu 0.2 Sc 0.8 BO 3 :Cr 3+ ,Yb 3+ phosphor exhibits exceptional luminescence performance, delivering SWIR radiant power of 18.4 mW with 9.3% of blue-to-SWIR power conversion efficiency and 5.0% of electricity-to-SWIR light energy conversion efficiency at 120 mA driving current. Moreover, under the illumination of high-power SWIR LED, covert information identification and night vision lighting have been realized, demonstrating a very bright prospect for practical applications.
研究领域:
光学材料
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固态照明
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红外光谱学
·
发光二极管技术
·
光转换材料
✓ 已验证
DOI
高影响因子
OPTICS AND LASER TECHNOLOGY
·
2025
·
IF 5
Jiahao Li,Yong Lin,Dong Zhou,Shuo Zhang,Wei Yuan,Wenming Su,Xiuqing Meng,Xinzhou Wu,Congcong Chi,Desheng Kong,Zheng Cui
Due to their high contrast, low cost, simple preparation and low energy consumption, alternative current electroluminescence (ACEL) devices are ideal for information display in wearable electronic systems. However, ACEL displays require high driving voltage normally above 100 V. Achieving high brightness at human-safety driving voltage in ACEL devices remains a challenge. In this study a new field enhancement strategy has been developed by doping the bottom dielectric layer with materials that have a high permittivity. In this way, the electric field can be concentrated in the luminescent layer and the charge separation of the ZnS/Cu powders can be improved, which helps to lower the driving voltage of ACEL while achieving high brightness of light emission. A high brightness of 175.2 cd/m 2 was obtained at the human-safety voltage of 35 V, The brightness can reach 1448.3 cd/m 2 at 110 V. The field enhancement strategy can be implemented by simple screen-printing process and the ACEL can be made on a fabric substrate with mechanical cyclic durability. As a demonstrator of human wearable display, the ACEL was integrated with a temperature sensing system to detect and display human body temperature in real time in both static and dynamic modes.
研究领域:
材料科学
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电子工程
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Qianxiong Wen,Cong Zhao,Meilin Fu,Yusai Xu,Xiangjia Sun,Jiaying Zheng,Yanrong Liang,Weidong Xiang,Xiaojuan Liang,Zhaoping Chen
Phosphor-in-glass (PiG) has been prepared into various types of phosphor films owing to its simplicity process, exceptional color purity, and convenient color adjustability. Nevertheless, existing reflective PiGs films have encountered limitations in terms of stability and feasibility as reliable color converters, mainly attributed to issues related to thermal deposition and insufficient optical efficiency. Herein, we propose to use AlN substrate with superior thermal conductivity to coat the TiO 2 layer to obtain TiO 2 –AlN (TA), which enhances the reflectivity of blue light to facilitate the light conversion process. By incorporating highly thermally stable LuAG:Ce-PiGs on a TA substrate, the LuAG:Ce-PiTA converter exhibits a luminous flux of 1102 lm@6.4 W, and maintains a relative intensity of 94.6% at 473 K benefiting from the high thermal conductivity of 34.1 W/(m·K). The addition of CASN 3 :Eu to the color converter 50 L&10C-PiTA enables an impressive CRI of 90.7. Relative luminescence intensities of LuAG:Ce-PiTA and 50 L&10C-PiTA only decrease by 5.35% and 3.28%, respectively, in the 24 h illumination aging decay test of the reflective laser module. The results confirm the suitability of the optimally designed TA substrate for LuAG:Ce color converter applications in high-power reflective laser illumination.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Shuyang Bao,Yueyuan Liang,Liansheng Wang,Luhan Wang,Li Xu,Yu Wang,Xiaojuan Liang,Weidong Xiang
Solid laser lighting with high photoelectric conversion efficiency and compact size has been increasingly vital in lighting applications. Extensive research has been conducted to obtain high-quality color converters for application to high-power and high-luminance laser lighting. Currently, Y3Al5O12:Ce3+ phosphor in glass (Ce:PiG) and Y3Al5O12:Ce3+ phosphor-in-glass film (Ce:PiF) possessing high efficiency, low cost, easy fabrication, and controllable chromaticity are becoming the most mainstream research directions. In this study, by modifying the glass particle size and sintering temperature, investigating the relevant host glass, and so forth, high-performance Ce:PiG was developed through a one-step co-sintering technology. It possesses a high internal quantum efficiency, approaching 100% of the original phosphors (92.5%). The luminous efficacy (LE) of the Ce:PiG was 240 lm/W at 2.18 W/mm2 under 450 nm blue laser diode (LD) excitation, which is the best result yet reported. Furthermore, to enhance the laser saturation threshold, the fabricated Ce:PiF relying on a sapphire substrate can withstand an 8 W/mm2 blue incident power density. The obtained sample can even reach an LE of 251.5 lm/W, which is an obvious improvement to Ce:PiG. In addition, the result, an LD module combined with the sample that meets the standard white light source, indicates that this work has good prospects for white laser lighting.
研究领域:
光电技术
·
材料科学
·
照明工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2025
·
IF 5.1
GanYu Cai,Qiang-Qiang Zhu,Guojuan Wang,Zetao Shen,Yue Zhai,YuBin Kang,Le Wang
Laser-driven light possesses exceptional brightness, rendering it particularly suitable for underwater lighting (UL) and underwater wireless optical communication (UWOC). However, achieving high-brightness light remains a challenge due to significant luminescence quenching in color converters caused by heat accumulation from high-power laser excitation. This study proposes an innovative approach for utilizing laser lighting in UL and UWOC applications by directly immersing color converters in water to eliminate thermal-induced luminescence saturation. To develop color converters capable of prolonged contact with water, we significantly enhanced the water stability of Y3Al5O12:Ce phosphor-in-glass (PiG) film through Si-N co-doping and a novel waterproof structure. Due to direct contact with water, the underwater illuminance of PiG film could reach as high as 294383 lux under 34.9 W/mm² blue laser excitation, with no luminescence saturation observed. Due to the optimized phosphor stability and waterproof design, the illuminance of PiG film remained at 98.56%, 98.43%, and 98.70% of its original intensity after 50 days in clear water, hot water, and seawater, respectively. Finally, a portable underwater laser light source with a 60° divergence angle was developed in a simple transmissive excitation mode based on the PiG film. This light source could illuminate wide-area underwater environments at distances exceeding 20 m and facilitate wide-area UWOC over distances greater than 40 m. These findings pave the new way for the commercial application of laser-driven lighting devices in wide-area UL and UWOC.
研究领域:
光学材料
·
水下通信
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
InfoMat
·
2021
·Vol. 3
·期 11
·1272-1284
·
IF 25.405
Chunfeng Wang,Ronghua Ma,Dengfeng Peng,Xianhu Liu,Jing Li,Boru Jin,Aixian Shan,Yu Fu,Lin Dong,Wenchao Gao,Zhong Lin Wang,Caofeng Pan
Mechanoluminescent (ML) materials that directly convert mechanical energy into photon emission have emerged as promising candidates for various applications. Despite the recent advances in the development of both novel and conventional ML materials, the limited access to ML materials that simultaneously have the attributes of high brightness, low cost, self-recovery, and stability, and the lack of appropriate designs for constructing ML devices represent significant challenges that remain to be addressed to boost the practical application of ML materials. Herein, ML hybrids derived from a natural source, waste eggshell, with the aforementioned attributes are demonstrated. The introduction of the eggshell not only enables the preparation of the hybrid in a simple and cost-effective manner but also contributes to the homochromatism (red, green, or blue emission), high brightness, and robustness of the resultant ML hybrids. The significant properties of the ML hybrids, together with the proposed structural design, such as porosity or core–shell structure, could expedite a series of mechanic-optical applications, including the self-luminous shoes for the conversion of human motions into light and light generators that efficiently harvest water wave energy. The fascinating properties, versatile designs, and the efficient protocol of “turning waste into treasure” of the ML hybrids represent significant advances in ML materials, promising a leap to the practical applications of this flouring material family.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 13
·3901-3908
·
IF 6.641
Jinchun Wang,Xueyuan Tang,Peng Zheng,Shuxing Li,Tianliang Zhou,Rong-Jun Xie
Achieving super-high brightness laser-driven solid state lighting in a transmissive mode is significantly limited by the thermal robustness and light extraction efficiency of color converter materials. Therefore, it is a must to enhance the thermal conductivity and conversion efficiency of color converters by appropriate compositional design and microstructural tailoring. In this work, we propose thermally self-managing YAG:Ce–Al2O3 composite ceramic color converters that consist of luminescent YAG:Ce phosphor particles embedded in a thermally conductive Al2O3 matrix, which allows them to be combined with high-power blue laser diodes to create super-high brightness white laser-driven light without using any heat sink. The thermal conductivity of the ceramic color converters increases linearly from 10.2 to 32.5 W m−1 K−1 as the Al2O3 content varies from 0 to 90 wt%. Impressively, the composite ceramic with 60 wt% Al2O3 can withstand an incident laser power density of up to 20.1 W mm−2. A high-brightness white laser-driven light is obtained with a luminance of 982 Mcd m−2. Moreover, the secondary Al2O3 particles also act as scattering centers and enhance the light conversion efficiency. A maximum luminous efficacy of 157 lm W−1 is achieved under 11.94 W mm−2 blue laser excitation at an Al2O3 content of 24 wt%, increased by 27.3% compared to the Al2O3-free YAG:Ce ceramic. The as-designed YAG:Ce–Al2O3 phosphor ceramics thus validate their great suitability in high-power and high-brightness laser-driven solid-state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
NANO LETTERS
·
2016
·
IF 13.779
Xiaoyu Zhang,Hong Lin,He Huang,Claas Reckmeier,Yu Zhang,Wallace C. H. Choy,Andrey L. Rogach
High photoluminescence quantum yield, easily tuned emission colors, and high color purity of perovskite nanocrystals make this class of material attractive for light source or display applications. Here, green light-emitting devices (LEDs) were fabricated using inorganic cesium lead halide perovskite nanocrystals as emitters. By introducing a thin film of perfluorinated ionomer (PFI) sandwiched between the hole transporting layer and perovskite emissive layer, the device hole injection efficiency has been significantly enhanced. At the same time, PFI layer suppressed charging of the perovskite nanocrystal emitters thus preserving their superior emissive properties, which led to the three-fold increase in peak brightness reaching 1377 cd m–2. The full width at half-maximum of the symmetric emission peak with color coordinates of (0.09, 0.76) was 18 nm, the narrowest value among perovskite based green LEDs.
研究领域:
材料科学
·
光电技术
·
纳米科技
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 37
·11449-11456
·
IF 6.641
Yirong Xu,Shuxing Li,Peng Zheng,Le Wang,Shihai You,Takashi Takeda,Naoto Hirosaki,Rong-Jun Xie
To achieve extra-high brightness laser lighting, the bottleneck of thermally-induced luminance saturation that phosphor materials (i.e., color converters) usually suffer from under high power density laser excitation must be broken. However, the mechanisms for thermal saturation are not fully understood yet. Here, thermal saturation of typical Ce3+-doped garnet phosphor ceramics was systematically investigated by considering the balance among heat generation, dissipation and resistance of color converters. With increasing Ce concentration (0.0167 → 0.433%), the thermal saturation threshold decreases due to more heat generation (i.e., 3.97 → 6.73 W at an incident laser power of 6.73 W). A tunable saturation threshold (2–49 W mm−2) was observed by a chemical substitution strategy because of the difference in the thermal resistance and heat generation. The sample thickness exerts a complex influence on the saturation threshold accompanied by increased heat generation and enhanced heat dissipation corroborated by a broader temperature distribution curve. Based on these investigations, a high-flux white light of 2347.9 lm is obtained with robust YAG:Ce ceramics irradiated with a high power density of 31.94 W mm−2. Moreover, a promising green color converter able to withstand a blue laser power density of 49 W mm−2 was discovered for laser displays with an output luminous flux of 3967.3 lm. This work provides a principle to design and/or select phosphor materials with high thermal saturation thresholds, thus accelerating the rapid development of laser-driven lighting and displays.
研究领域:
光学材料
·
激光技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Technologies
·
2023
·Vol. 8
·期 14
·2202162
·
IF 6.8
Yang Peng,Jiuzhou Zhao,Zikang Yu,Qing Wang,Jiaxin Liu,Mingxiang Chen,Yun Mou
Huge heat energy is ultimately generated in the color converter as a result of the nonradiative recombination of high-power laser excitation. Inspired by the thermoelectric conversion, a high-performance phosphor-in-glass film (PIGF) coated on a thermoelectric generator (TEG) for nonradiative energy recycling in high-brightness laser lighting is proposed. The heat-resistance PIGF with high luminescence is tightly coated on the hot-side ceramic of TEG, while yielding a bright white light and promoting the heat conduction between PIGF and TEG. At the PIGF thickness of 60 µm, the PIGF-TEG enables a natural white light with a luminous flux of 464 lm, a luminous efficacy of 194 lm W −1 , a correlated color temperature (CCT) of 6552 K, and an appropriate chromaticity coordinate of (0.3117, 0.3302) under a laser power of 2.39 W. Aside from the high-brightness output white light with a luminous flux of 1045 lm, the laser-driven PIGF-TEG produces the output voltage and current of 0.46 V and 174 mA under a laser power of 5.61 W, respectively. Therefore, the proposed PIGF-TEG provides a potential strategy for heat energy recycling in high-power phosphor-converted lighting.
研究领域:
材料科学
·
光学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Huanyu Zhang,Tingxiu Yu,Chaoqiang Wang,Ruofei Jia,Azhar Ali Ayaz Pirzado,Di Wu,Xiujuan Zhang,Xiaohong Zhang,Jiansheng Jie
Micro-/nanosized organic–inorganic hybrid perovskite single crystals (SCs) with appropriate thickness and high crystallinity are promising candidates for high-performance electroluminescent (EL) devices. However, their small lateral size poses a great challenge for efficient device construction and performance optimization, causing perovskite SC-based light-emitting diodes (PSC-LEDs) to demonstrate poor EL performance. Here, we develop a facile liquid-insulator bridging (LIB) strategy to fabricate high-luminance PSC-LEDs based on single-crystalline CH3NH3PbBr3 microflakes. By introducing a blade-coated poly(methyl methacrylate) (PMMA) insulating layer to effectively overcome the problems of leakage current and possible short circuits between electrodes, we achieve the reliable fabrication of PSC-LEDs. The LIB method also allows us to systematically boost the device performance through crystal growth regulation and device architecture optimization. Consequently, we realize the best CH3NH3PbBr3 microflake-based PSC-LED with an ultrahigh luminance of 136100 cd m–2 and a half-lifetime of 88.2 min at an initial luminance of ∼1100 cd m–2, which is among the highest for organic–inorganic hybrid perovskite LEDs reported to date. Moreover, we observe the strong polarized edge emission of the microflake-based PSC-LEDs with a high degree of polarization up to 0.69. Our work offers a viable approach for the development of high-performance perovskite SC-based EL devices.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
半导体器件
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）