Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 26
·8767-8775
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IF 6.4
Bo Chen,Chuanxin Liao,Dewang Li,Hongli Liu,Shirong Wang
Thermally activated delayed fluorescence (TADF) emitters that satisfy the blue gamut of the BT.2020 standard have rarely been reported, severely hindering the application of TADF in full-color ultra-high definition (UHD) displays. Herein, three solution-processable ultra-deep-blue TADF emitters, namely BFCz-TDBA, ICz-TDBA and PIdCz-TDBA, were cleverly designed and synthesized by linking a rigid and symmetric oxygen-bridged boron acceptor directly to carbazole derivative donors with different strengths. All these TADF emitters exhibited ultra-deep-blue photoluminescence below 430 nm with a narrow full-width-at-half-maximum of less than 50 nm. Furthermore, their favorable solubility and thermal stability make them suitable for solution processing. The resultant solution-processed ultra-deep-blue organic light-emitting diodes (OLEDs) based on all the emitters exhibited a maximum external quantum efficiency of 12.0%, 13.0% and 12.2% for BFCz-TDBA, ICz-TDBA and PIdCz-TDBA, respectively. Correspondingly, their related Commission Internationale de l’Eclairage (CIE) chromaticity coordinates were (0.16, 0.044), (0.16, 0.049) and (0.16, 0.046), respectively, which represent the state-of-the-art deep-blue emission among solution-processed devices (CIEy < 0.05). The typical BT.2020 blue gamut of these materials demonstrate their enormous potential for application in UHD displays.
研究领域:
材料科学
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光学工程
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显示技术
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DOI
高影响因子
ACS Applied Electronic Materials
·
2024
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IF 4.3
Yanjun Duan,Bingxin Yang,Yujiao Ma,Chao Gao,Shengren Li,Lin Yang,Zhiqiang Li
High-quality photodetectors are essential for getting external information, especially those operating in the near-infrared range. These devices play a critical role in remote communication systems by effectively converting light into electronic signals effectively. The emerging copper-based chalcogenides have attracted attention for thin film solar cells and self-powered photodetectors. However, they can detect only certain wavelengths of infrared light because of their wide bandgaps. In this work, we prepared a hexahydroxy chalcogenide copper–cadmium-zinc–tin sulfur–selenium (CCZTS) absorber with a narrow bandgap of 0.87 eV. Then, we developed a self-powered CCZTS/cadmium sulfide (CdS) thin film photodetector. Furthermore, the manganese (Mn2+) dopant is incorporated into the CdS buffer layer to improve the heterojunction interface properties. As a result, the devices based on the CCZTS/CdS:Mn heterojunction exhibit high responsivity, reduced dark current, and a fast response speed in the wavelength range of 300–1550 nm. At 1319 nm, it has a responsivity of 0.96 A W–1, a detectivity of 3.79 × 1012 Jones. In addition, the resulting CCZTS-based photodetector is successfully integrated into an optical communication system as an optical signal receiver. Our results demonstrate that it has a significant potential for low-cost infrared photodetection and optical communications.
研究领域:
材料科学
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光电子学
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DOI
高影响因子
Advanced Materials Technologies
·
2021
·Vol. 6
·期 12
·2100654
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IF 7.848
Ze Wang,Yaqian Zhang,Xiaodong Liu,Yanxia Yu,Fucai Xu,Jing Ding,Xiaojuan Liang,Keqin Yang,Weidong Xiang
In this study, a simple low-temperature self-assembly strategy is used to synthesize the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite with a relatively high photoluminescence quantum yield (PLQY, 72%) and product yield (87%). As expected, the nanocomposite exhibits good photoluminescence (PL) performance and stability. Further, 90% of the PLQY is maintained even when heating at 100 °C for 24 h, and almost no emission degradation is observed after storage in ethanol for 10 days. Furthermore, the prepared CsPbBr 3 /Cs 4 PbBr 6 nanocomposite exhibits the reversible luminescence phenomenon by simply applying the wetting and drying process. This abnormal phenomenon is due to the internal phase transformation of the CsPbBr 3 /Cs 4 PbBr 6 nanocomposite. The potential application of the nanocomposite in anti-counterfeiting has been demonstrated. This work facilitates the production and application of inorganic metal halide perovskite-based functional materials.
研究领域:
材料科学
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光学
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化学
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DOI
高影响因子
INORGANIC CHEMISTRY
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2024
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IF 4.3
Gaoke Dong,Bing Hu,Chen Chen,Hailong Yu,Qiuju Han,Wenzhi Wu
Organic–inorganic metal halides have attracted great attention due to their tunable structural and spectroscopic properties. Here, two organic–inorganic hybrid manganese bromides, (TEMA)2MnBr4 (TEMA = triethylmethylammonium) and (TEBA)2MnBr4 (TEBA = benzyltriethylammonium), are synthesized using the evaporation crystallization method. Following a heat-induced phase transition at 363 K, the structure and optical properties of (TEMA)2MnBr4 change but return to their initial state upon cooling to room temperature, as confirmed by X-ray diffraction, photoluminescence (PL), and Raman spectra. Meanwhile, (TEBA)2MnBr4, with a larger Mn–Mn distance, exhibits a higher photoluminescence quantum yield of 98.1% and greater thermal quenching temperature. However, due to the poorer thermal stability of the organic cation, the crystal melts at 400 K, leading to fluorescence quenching. White LEDs based on (TEMA)2MnBr4 and (TEBA)2MnBr4 are successfully fabricated with color rendering indices of 97.4 and 97.2, respectively. The investigation provides deep insights into the structural and optical properties of (TEMA)2MnBr4 and (TEBA)2MnBr4, advancing research for LED display design by tuning organic cations.
研究领域:
材料科学
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光电技术
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固体化学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2021
·
IF 3.599
Liqin Yao,Shengan He,Wendong Nie,Lei Fu,Zhijian Liao,Wenting Cai,Ruixiang Wang,Jiaqing Peng,Xinyu Ye
Mn 4+ -activated (oxy)fluoride-based red phosphors have received extensive attention. In this work, a phase transformation from K 2 NbF 7 to K 3 HF 2 NbOF 5 was successfully achieved by stoichiometric control during coprecipitation process, resulting in a novel red phosphor K 3 HF 2 NbOF 5 :Mn 4+ with narrow-band emission. A systematic study was carried out on its crystal structure and luminescent properties. By introducing O ions into the local coordinated structure, the emission intensity of K 3 HF 2 NbOF 5 :Mn 4+ phosphors is 2.15 times as high as that of K 2 NbF 7 :Mn 4+ with a photoluminescence internal quantum yield (IQE) of 73.28% and absorption efficiency (AE) of 49.68%, which could be attributed to the layered structure of the oxyfluoride host. High quenching concentration of 8.39 mol% and short decay lifetime of 4.19 ms are realized. Based on K 3 HF 2 NbOF 5 :Mn 4+ and commercial YAG:Ce 3+ , a white light-emitting diode (WLED) for solid state lighting was fabricated, which has low CCT of 3802 K, high Ra of 86.3 and high luminous efficiency (LE) of 126.23 lm/W. Moreover, by employing commercial β-sialon:Eu 2+ and K 3 HF 2 NbOF 5 :8.39%Mn 4+ , another WLED with high LE of 95.78 lm/W and wide color gamut of 108.6% National Television Standard Committee (NTSC) standard for backlight lighting was packaged, indicating a great potential of K 3 HF 2 NbOF 5 :Mn 4+ as a red component in the application of backlight lighting.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shihai Miao,Yanjie Liang,Dongxun Chen,Ruiqi Shi,Xihui Shan,Yi Zhang,Fei Xie,Xiao-Jun Wang
Infrared-emitting phosphor-converted light-emitting diodes (LEDs) are desirable light sources for a very wide range of applications such as spectroscopy analysis, nondestructive monitoring, covert information identification, and night-vision surveillance. The most important aspect of infrared emitters for spectroscopy is to cover the widest possible wavelength range of emitted light. However, developing ultrabroad-band infrared emitters based on converter technology is still a challenging task due to the lack of suitable phosphor materials that emit in a wide wavelength range upon excitation from blue-emitting chips. Herein, this work demonstrates Cr3+-activated Mg2SiO4 infrared phosphors with a super wide infrared spectral range of 600 to 1400 nm and high internal quantum yield up to 80.4% upon 460 nm excitation. Site-selective occupancy of Cr3+ emitters in two different Mg sites in the Mg2SiO4 lattice results in two distinct broad emission bands peaking at 760 and 970 nm, both of which contribute to the ultrabroad-band infrared luminescence with a full width at half maximum (FWHM) of 419 nm. This is by far the broadest infrared emission to the best of our knowledge. On this basis, an ultrabroad-band infrared LED prototype has been fabricated by the combination of the Mg2SiO4:Cr3+ phosphor with a blue LED chip, which shows great potential for imaging and sensing applications. This work demonstrates that site-selective occupancy control of Cr ions is an effective strategy for developing ultrabroad-band Cr3+-doped phosphors.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Chem Catalysis
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2025
·
IF 11.6
Yunfeng Bao,Jingzhen Zhang,Shiwen Du,Sanlue Hu,Yejun Xiao,Zhaochi Feng,Fuxiang Zhang
Inorganic mixed-anion semiconductor photocatalysts are promising for water splitting due to their broad visible light absorption and structural stability. However, efficient photocatalytic production of hydrogen peroxide (H 2 O 2 ) remains challenging. This study reports a one-step photocatalytic method for H 2 O 2 production using the synthesized β-ZrNBr inorganic nanosheet photocatalyst, achieving an apparent quantum efficiency of 11.7% at 420 ± 10 nm and a solar-to-H 2 O 2 efficiency of 0.5%. This superior H 2 O 2 synthesis performance is attributed to efficient carrier mobility, high bulk charge carrier separation efficiency exceeding 70%, and the ability to directly promote water oxidation into H 2 O 2 . Additionally, 600 μmol L −1 g cat −1 of H 2 O 2 can be continuously generated over the β-ZrNBr film without significant decay under visible light in a homemade flow cell. Our work offers a scalable alternative for H 2 O 2 production using robust inorganic semiconductors under ambient conditions.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2024
·
IF 2.6
Zha Jiahao,He Chongjun,Chen Fangzhou,Wang Hongwei,Dong Biao,Liu Lijuan,Xia Mingjun,Deng Chenguang,Li Qian,Lu Yuangang,Chen Huiting
Oxide matrix red-emitting phosphors are deemed as excellent color converters for white light emitting diodes (WLEDs) and laser diodes (LDs). Manganese-doped MgAl 2 O 4 powder was synthesized by a solid-state reaction method at different sintering temperatures. Microstructure shows that grain size is mainly in the range of 0.2–5 μm, and grain agglomeration occurs with increased sintering temperature. XPS analysis indicates that the doped Mn ion exhibits a valence state of + 4 within the MgAl 2 O 4 matrix. The diffraction peak of the phosphors is shifted by the sintering temperature, which affects lattice constant. Upon excitation by 300 nm ultraviolet light, the samples emit asymmetric broadband red light within the range of 620–720 nm, attributed to Mn 4+ ion’s transition from 2 E g to 4 A 2g states. With the increasing temperature, the main emission peak shifts from 677 nm to 650 nm, ascribed to the change in energy level ( 2 E g ) resulting from the reduction of Al 2 O 3 phase. Crystal field theory confirmed that Mn 4+ ions are within a strong crystal field environment created by MgAl 2 O 4 matrix. By affecting particle size and crystallinity, the sintering temperature influences the fluorescence lifetime of the Mn 4+ ion. Notably, these red-emitting phosphors exhibits remarkable thermal stability as their emission intensity remains approximately at 58% of initial intensity even at elevated temperature (435 K). Consequently, Mn 4+ : MgAl 2 O 4 red-emitting phosphors with high thermal stability render them promising candidates for WLED applications.
研究领域:
材料科学
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光学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Na-Na Zhang,Yu-Guo Yang,Xue-Yuan Yan,Meng-Qi Wang,Yuan-Yuan Zhang,Hua-Di Zhang,Rui Zhang,Cheng-Cheng Qiu,Fu-Di Chen,Ji-Yang Wang
In the present work, orange-red Sm 3+ doped La 3 Ga 5 SiO 14 phosphors were successfully formed through high temperature solid state method at 1350 °C. The phase purity, size distribution, vibrations, absorption and series of luminescence characteristics were studied, respectively. The X-ray diffraction and Rietveld refinements results show the single phase and crystal lattice information. The results of scanning electron microscope and energy-dispersive spectroscopy demonstrate the basic particle shape and verify the constituent elements for the prepared samples. The infrared spectra clarify the phonon vibration properties of the La 3 Ga 5 SiO 14 :Sm 3+ phosphors. The UV–visible absorption spectra indicate that the absorption properties and the corresponding band gaps. The luminescence results show that the La 3 Ga 5 SiO 14 :Sm 3+ phosphors emit intense orange-red emission peaking at 600 nm as excited at 401 nm. The optimum doping concentration of Sm 3+ ion is x = 0.05 and the mechanism of concentration quenching is from dipole-quadrupole interaction. In addition, the prepared phosphors have good thermostability, and its thermal activation energy is 0.2161 ev. Finally, red and white light emitting diodes were successfully manufactured with 395 nm chip. All experimental results show that the La 3 Ga 5 SiO 14 :Sm 3+ phosphors have good application prospect in light emitting diodes .
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Xiaoqin Sun,Tianyu Wang,Xiaoxiang Xu
Heterojunction photocatalysts possess high efficiency in photogenerated electron-hole separation, which give significant advantages in the field of solar hydrogen production . Herein, a novel ZnIn 2 S 4 @S doped g-C 3 N 4 (ZIS@SCN) heterojunction with mesoporous structure was prepared for photocatalytic water splitting under visible light . Characterization showed that the element of S was successfully introduced into g-C 3 N 4 (CN) by replacing N to form C–S–C bonds and significantly enhanced the visible light absorption ability. The constructed heterojunction exhibited excellent photocatalytic hydrogen evolution under visible light. The best performance belonged to the sample of ZIS@100SCN. The corresponding H 2 production rate reached 9.3 mmol h −1 g −1 , which was 1.87-fold higher than that of the undoped one. More importantly, the heterojunction realized overall water splitting of H 2 and O 2 evolution simultaneously with good stability. The mechanism analysis indicted that introducing the element of S could regulate the band structure of CN and induce the charge transfer switching of a ZnIn 2 S 4 @g-C 3 N 4 (ZIS@CN) photocatalyst from Ⅰ-type to S-scheme, which promoted the efficient spatial charge separation and maintained the high redox ability of the ZIS and SCN. This work provides an insight in construction high performance S-scheme heterojunction for water splitting with a doping method.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Hang-bo Zheng,Di Wu,Yuan-li Wang,Xiao-pan Liu,Peng-zhao Gao,Wei Liu,Jin Wen,Evgeny V. Rebrov
A new approach was proposed for the preparation of metal–organic framework/metal oxide composites in one step using only metal salts. Here, crystalline rhombohedral dodecahedron ZIF-8, hollow ZnO microsphere , and ZIF-8/ZnO composites were obtained in different one-pot solvothermal processes where the growth toward individual ZIF-8 and ZnO phases and toward ZIF-8/ZnO composites was controlled by adjusting the ratio of metal salts to 2-methylimidazole. Subsequently, a series of derived (C and/or N)-doped ZnO nanoparticles was obtained by a two-step calcination process. The absorption kinetics and photocatalytic activity in methyl orange degradation under visible light were investigated. ZIF-8-derived ZnO could maintain their original morphology and displayed excellent photocatalytic activity 10 times higher than that of the original ZIF-8.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Renping Cao,Yuming Jiao,Xuantian Wang,Xun Ouyang,Huijun Wan,Ting Chen,Guotai Zheng,Shikun Xie
Novel Mg 2 La 3 NbO 9 :Mn 4+ powder phosphors are successfully synthesized by the high-temperature solid-state reaction method under ambient air. The crystal structure, morphology, decay lifetimes, time-resolved emission spectra, and luminescence properties are investigated. The excitation spectrum of Mg 2 La 3 NbO 9 :Mn 4+ phosphor monitored at 708 nm is observed in the region from 210 nm to 600 nm. Mg 2 La 3 NbO 9 :Mn 4+ phosphor with excitation at the ultraviolet (UV) and blue light can emit the far-red emission with the emission band peaking at ~708 nm because of the 2 E → 4 A 2 transition of Mn 4+ and the corresponding chromaticity coordinates (0.7322, 0.2678). The optimal doping concentration of Mn 4+ ion is ~0.6 mol%. The decay lifetime of Mg 2 La 3 NbO 9 :xMn 4+ phosphors decrease from 1.143 ms to 1.099 ms with increasing the Mn 4+ ion concentration from 0.2 mol% to 1.0 mol%. The good thermal stability of Mg 2 La 3 NbO 9 :Mn 4+ phosphor is confirmed by the temperature-dependent emission spectra. The luminous mechanism of Mg 2 La 3 NbO 9 :Mn 4+ phosphor is explained by using the Tanabe Sugano energy level diagram of Mn 4+ ion. All the experimental results imply that Mg 2 La 3 NbO 9 :Mn 4+ phosphor has a potential application in the white light-emitting diodes (LEDs) field.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）