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1.
Yan Xie Xue Geng Yuan Wang Jiang Guo Yuhui Lu Qiuyi Lv Zhijiang Ma Dan zhang Jin Zhao Bin Deng Ruijin Yu 《Journal of the American Ceramic Society》2022,105(2):1300-1317
High-efficiency and far-red light phosphors based on Mn4+-doped inorganic luminescence materials are beneficial to plant cultivation. However, Mn4+-doped oxide phosphors have a common problem of low quantum efficiency. Alkali metal ion codoping can effectively improve the luminescence properties of Mn4+-activated oxide phosphors. Herein, a series of Sr2InSbO6:Mn4+, M (SISO:Mn4+, M) (M = Li+, Na+, and K+) far-red-emitting phosphors codoped alkali metal ions were first synthesized. Density functional theory calculation indicated that SISO is a kind of indirect bandgap material with a bandgap of ∼1.60 eV. The SISO:Mn4+ samples showed a far-red light at 698 nm upon 365 nm, which perfectly matched the absorption spectrum of the far-red-phytochrome (Pfr) of plants. The doping concentration of the SISO:Mn4+ samples was optimized to be 0.006 mol. The concentration quenching mechanism was defined as dipole–dipole interaction by combining the Dexter theory and the Inokuti–Hirayama model. Optimizing the sintering temperature and codoped with alkali metal ions (Li+, Na+, and K+) could improve the luminescent intensity of SISO:Mn4+. The optimum sintering temperature was 1300°C. The internal quantum efficiencies of SISO:0.006Mn4+ and SISO:0.006Mn4+, 0.006Li+ phosphors are 22.67% and 60.56%, respectively. SISO:Mn4+, Li+ phosphors-based plant growth light-emitting diodes (LEDs) demonstrate excellent optical stability and long lifetime. Thus, these phosphors are promising candidates for plant cultivation LEDs. 相似文献
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Sheng Wu Quan Liu Mikhail G. Brik Puxian Xiong Dong Wang Guoxing Zhang Yan Chen 《Journal of the American Ceramic Society》2022,105(9):5793-5806
Developing environment-friendly dual-emission phosphors of both blue–cyan and deep-red lights is desirable for the utilized indoor plant lighting research. Notably, the naked 6s and 6p Bi3+ ions are sensitive to the lattice sites, which emit from Ultraviolet (UV) to red lights in various crystal compounds. Meanwhile, the 2E → 4A2g transition of Mn4+ ions promises its deep-red light emissions, which satisfies the demand for specific wavelength lights for plants growth. Hence, a Bi3+/Mn4+ co-doped Sr2LaGaO5: Bi3+, Mn4+ (SLGO:Bi3+:Mn4+) phosphor was finally synthesized. The phase, micromorphology and luminescent properties were systematically evaluated. Upon excitation at 350 nm light, dual emissions of both blue–cyan (470 nm) and deep-red (718 nm) lights were observed. Besides, due to the pronounced photoluminescence (PL) spectral overlap between Bi3+ and Mn4+ ions, a potential energy transfer process from Bi3+ to Mn4+ ions was confirmed. The relative PL intensities between Bi3+ and Mn4+ ions can be tuned just by adjusting the Mn4+ ion concentration. Besides, Li+ co-doping has been evidenced to improve the deep-red emissions (718 nm) of SLGO:0.005Mn4+ due to charge compensation and rationally designed lattice distortion, together with the improved thermal stability. Finally, the emissions of SLGO:Bi3+, Mn4+, Li+ phosphor suit properly with the absorption of the four fundamental pigments for plant growth, indicating that the prepared phosphorescent materials may have a prospect in plant light-emitting diodes lighting. 相似文献
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Wei Xie Canxin Tian Fucong Lyu Zesong Wang Changwei Zou Fengwen Kang Huafeng Dong Guohuan Sun 《Journal of the American Ceramic Society》2019,102(6):3488-3497
Up until now, many previous works have indicated us that the photoluminescence (PL) properties of phosphors sometimes can be changed with the change in the external temperature, resulting in the anomalous PL phenomena and correlated new applications that are difficult to achieve at room temperature. In this work, we report the temperature-dependent Bi3+-related PL properties in the YVO4:Bi3+ phosphor. Our findings show that increasing the temperature from 10 to 300 K enables manipulating the energy interaction from groups to Bi3+, thereby leading to the temperature-induced color tuning from blue (0.183, 0.212) to yellow (0.418, 0.490). Upon this heating process, we further reveal that the dynamic Bi3+ luminescence has experienced a regular transition from double-exponential to single-exponential decay, which results in the decrease in the average Bi3+ lifetime from 122.606 to 0.376 μs. Discussions on the PL results imply that the tunable PL observations are due to the interplay of temperature-dependent energy transfer from groups to Bi3+ and redistribution of the excited 3P0 and 3P1 states of Bi3+ upon the thermal stimulation. This work not only presents the temperature-triggered Bi3+ tunable properties in the well-studied YVO4 host lattice but also can provide new insights into revealing Bi3+-related PL mechanism in other Bi3+-doped photonic materials in the future and, in the meanwhile, gives some directive ideas for us to explore previously unnoticed applications for rare-earth (RE; eg, Eu3+, Pr3+, Tb3+, Eu2+, Er3+, etc) and other non-RE (eg, Bi3+, Mn4+, Mn2+, Cr3+, etc) doped phosphors. 相似文献
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Weilun Zhang Yujun Liang Yingli Zhu Shiqi Liu Haoran Li Wen Lei 《Journal of the American Ceramic Society》2019,102(9):5223-5233
A series of Ce3+ and Tb3+ singly- and co-doped NaBa4(AlB4O9)2Cl3 (NBAC) phosphors have been synthesized via high-temperature solid state route. The crystal structure, morphology, photoluminescent properties, thermal properties and energy transfer process between Ce3+ and Tb3+ were systematically investigated. The structure refinements indicated that the phosphors based on NBAC crystallized in P42nm polar space group in monoclinic phase. The emission color could be tuned from blue (0.1595, 0.0955) to green (0.2689, 0.4334) via changing the ratio of Ce3+/Tb3+. The energy transfer mechanism of Ce3+/Tb3+ was verified to be dipole–quadrupole interaction via the examination of decay times of Ce3+ based on Dexter's theory. The good thermal stability showed the intensities of Ce3+ at 150°C were about 66.9% and 64.88% in NBAC:0.09Ce3+ and NBAC:0.09Ce3+, 0.07Tb3+ of that at room temperature, and the emission intensities of Tb3+ remained 102.41% in NBAC:0.11Tb3+ and 95.22% in NBAC:0.09Ce3+, 0.07Tb3+ due to the nephelauxetic shielding effect and the highly asymmetric rigid framework structure of NBAC. The maximum external quantum efficiency (EQE) of Ce3+ in NBAC:0.09Ce3+, yTb3+ phosphors could reach 43.38% at y = 0.13. Overall, all the results obtained suggested that NBAC:Ce3+, Tb3+ could be a promising option for n-UV pumped phosphors. 相似文献
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Langping Dong Liang Zhang Yonghui Xu Shuwen Yin Hongpeng You 《Journal of the American Ceramic Society》2021,104(8):4109-4118
In this work, we report a novel phosphor LSPO:Mn2+ that exhibits red emission at about 616 nm and pleasant broad near-infrared (NIR) emission at about 800 nm with a full width at half maximum (fwhm) of 112 nm. The structure and spectra show that the doped manganese ions occupy two kinds of Sc sites forming Mn1 and Mn2 emission centers, which are responsible for red and NIR emission, respectively. The XPS and low-temperature fluorescence spectra reveal that both red and NIR emissions come from the Mn2+ ions. Besides, NIR luminescence is improved by doping Yb3+ in LSPO:Mn2+, leading to the broadened NIR emission range (700-1100 nm) and enhanced luminescent thermal stability. Our results suggest that the prepared LSPO:Mn2+ and LSPO:Mn2+,Yb3+ phosphors offer the potential applications as red and NIR components in phosphor-converted white-light-emitting diodes (pc-WLED) and broadband NIR pc-LED. Meanwhile, this work provides a new way to design novel broadband NIR phosphors. 相似文献
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利用水热法合成了NaY(WO4)2:Dy3+上转换荧光粉. 通过XRD、SEM表征该荧光粉结构和形貌. 探讨了Dy3+浓度、pH值、反应温度及焙烧温度对NaY(WO4)2:Dy3+晶体结构、形貌及发光性能的影响,得到在Dy3+浓度为0.5%,pH=8,反应温度180℃,800℃焙烧条件下的样品具有最佳上转换发光性能. 利用776 nm近红外光激发NaY(WO4)2:Dy3+,观察到480 nm处的蓝光发射峰以及577 nm处的黄光发射峰. 其中蓝光来自Dy3+离子的4F9/2→6H15/2跃迁,黄光由Dy3+离子4F9/2→6H13/2跃迁产生. 相似文献
9.
Xicheng Wang Xiaopeng Zhou Yaxin Cao Qi Wei Zhengyan Zhao Yuhua Wang 《Journal of the American Ceramic Society》2019,102(11):6724-6731
Red phosphor is indispensable to achieve warm white light in the white light diode (WLED) application. However, the current red phosphors suffer from high cost and harsh synthesis conditions. In this study, an oxide-based rare-earth-free red-emitting phosphor Li3Mg2NbO6:Mn4+ (LMN:Mn4+) has been successfully synthesized by a simple solid-state reaction method. The relationship between crystal structure and luminescence was investigated in detail. The site occupancy of the doping Mn4+ ion in the LMN host has been discussed from the point of bond valence sum. How the coordination environment of doping Mn4+ affects the energy level of doping Mn4+ ion has been illustrated via the Tanabe-Sugano energy-level diagram. Moreover, warm white light has been obtained using LMN:Mn4+ as compensator to the YAG:Ce3+. 相似文献
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Yan Sun Fei Yu Meisong Liao Juping Ma Xin Wang Dongbing He Weiqing Gao Jonathan Knight Lili Hu 《Journal of the American Ceramic Society》2020,103(12):6847-6859
In this work, we systematically study the spectroscopic properties of Tb3+/Dy3+ co-doped phosphate glasses in the visible spectral region and explore the sensitization role of Dy3+ in the enhancement of visible fluorescence of Tb3+ ions. Judd-Ofelt parameters Ω2 and Ω4/Ω6 of the phosphate glass as host for Tb3+ are calculated as 21.60 × 10-20 cm2 and 0.73, respectively, based on the measured spectral absorption. Multiple energy transfer (ET) routes from Dy3+ to Tb3+ and their efficiencies are characterized, and the enhanced fluorescence properties of Tb3+ are investigated, including the emission spectral strength and the spontaneous emission lifetime as functions of Dy3+ doping concentration. The efficient nonradiative ET processes between Dy3+ and Tb3+ allow a moderate concentration level of Tb3+ to achieve favorably stronger spectral absorption at blue and ultraviolet wavelengths. Tb3+/Dy3+ co-doped phosphate glass shows promising potential for phosphors and lasing operation at visible wavelengths. 相似文献
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研究了SrAl2O4:Eu^2 ,Dy^3 长余辉材料的一种新合成方法。首先利用水热法制备出该发光材料的前驱体,然后将此前驱体粉体在还原气氛下高温烧结,得亮度高,余辉时间长的洲SrAl2O4:Eu^2 ,Dy^3 超细长余辉材料,并对其发光性能进行了研究。并对水热法和复合沉淀法合成的此种材料进行了比较。 相似文献
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BaAlxOy:Eu2+,Dy3+ blue‐green phosphor samples were synthesized by a combustion method at the low temperature of 500°C. Phosphor nanocrystallites with high brightness were obtained without significantly changing the crystalline structure of the host. The crystallite sizes determined from the Scherrer equation ranged between 34 and 41 nm. Different volume fractions of the BaAlxOy:Eu2+,Dy3+ powder were then introduced in LDPE polymer. The resulting composites were similarly analyzed and also thermally characterized by means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). PL results indicate that the LDPE‐phosphor interface, which is considered to have an influence on the composite behavior, did not significantly change the spectral positions of the phosphor materials, whose major emission peaks occurred at about 505 nm. The improved afterglow results for the composites may have been caused by morphological changes due to increased surface area and defects. Thermal results indicate that the BaAlxOy:Eu2+,Dy3+ particles acted as nucleating centers and enhanced the overall crystallinity in the LDPE nanocomposite while preventing lamellar growth, hence reducing the crystallite sizes in LDPE. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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Yuanyuan Zhang Lefu Mei Sergey M. Aksenov Dina Deyneko Haikun Liu Dian Zhang Zhaohui Huang 《Journal of the American Ceramic Society》2020,103(4):2602-2609
Ca9La(PO4)5(SiO4)F2:Tb3+,Dy3+ (CLPSF:Tb3+,Dy3+) phosphors were successfully prepared using the traditional solid-state technique. The crystal structure was refined and the luminescence properties have been examined in detail. The band gap and electronic structure of Ca9La(PO4)5(SiO4)F2 were performed by the periodic density functional theory (DFT) calculation. The spectral and fluorescence decay dynamics of CLPSF:Tb3+,Dy3+ show that the energy transfer behavior between Tb3+ and Dy3+ ions is observed. The CLPSF:Tb3+,Dy3+ phosphors can be efficiently excitable at the wavelengths range from 300 to 500 nm. The emission spectrum covers the whole visible part of the spectra with the sharp emission bands in red, green, and blue regions. The correlated color temperature (CCT) and color rendering index (CRI) of white light emission could be improved by the fine-tuning of the Tb3+ and Dy3+ ions ration in accordance with the energy transfer behavior. Thus, the CLPSF:Tb3+,Dy3+ phosphor could be used as a material for the near-ultraviolet (n-UV) and white light-emitting diodes (w-LEDs). 相似文献
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Peixin Gao Peng Dong Zeyun Zhou Qian Li Honghui Li Zhi Zhou Mao Xia Peihua Zhang 《Ceramics International》2021,47(12):16588-16596
Deep-red light emitting phosphors are widely used in LEDs for indoor plant growth because of the critical role played by red light in plant growth. The luminescence properties of deep-red phosphors are still not well understood at present. An energy transfer strategy is a common and effective method to improve luminescence properties. In principle, the energy transfer process may occur when the sensitizer's emission spectra overlap with the activator's excitation spectra. In this work, Bi3+ and Mn4+ were incorporated into the matrix of Gd2MgTiO6 as sensitisers and activators, respectively. Mn4+ ions tend to occupy the [TiO6] octahedral site and the Bi3+ ions are expected to substituted in the site of Gd3+. The energy transfer process from Bi3+ to Mn4+ was realised and the photoluminescence (PL) intensity of Mn4+ increased with the doping content of Bi3+. Upon excitation at 375 nm, the PL intensity of Mn4+ increased to 116.4% when the doping concentration of Bi3+ reached 0.3%. Finally, the pc-LED devices were prepared by a Gd2MgTiO6:Bi3+, Mn4+ phosphor. The high red luminescence indicated that this phosphor has potential applications in indoor LED lighting. 相似文献
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《Ceramics International》2017,43(8):6353-6362
Red phosphors serve an important function as red components of warm white light-emitting diodes (WLEDs). Given their remarkable luminescent properties and low cost, Mn4+-doped phosphors are attracting significant attention. In this study, the novel red phosphor Ba2GdNbO6:Mn4+ was synthesized through high-temperature solid-state reaction. The host Ba2GdNbO6 with a double-perovskite structure was investigated. Scanning electron microscopy and thermogravimetric analysis were performed to evaluate the structure and thermal stability of the phosphor, respectively. PLE and photoluminescence spectra were further used to study the luminescence properties of the phosphor. Moreover, crystal field strength and Racah parameters were calculated to estimate the nephelauxetic effect of Mn4+ on the Ba2GdNbO6 host lattice. Thermal quenching characteristics were also analyzed. The fabricated red-emitting LED revealed its potential application in WLEDs. 相似文献
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Shengqiang Liu Shiyou Zhang Ning Mao Zhen Song Quanlin Liu 《Journal of the American Ceramic Society》2020,103(12):6793-6800
Broadband near-infrared (NIR) phosphors have received increasing attention for fabricating phosphor-converted light-emitting diodes (pc-LEDs) as NIR light source. Most of the reported broadband NIR phosphors originate from Cr3+ in weak crystal field environments. Herein, we report a luminescent material, MgAlSiN3:Mn2+ with CaAlSiN3-type structure, demonstrating that broadband deep-red-to-NIR emission can be achieved via doping Mn2+ into crystallographic sites with strong crystal field in inorganic solids. This phosphor is synthesized via easy-handle solid-state reaction, and the optimized sample, (Mg0.93Mn0.07) AlSiN3 shows an emission band with peak at ~754 nm, FWHM of 150 nm, and internal quantum efficiency of 70.1%. The photoluminescence intensity can further be enhanced by co-doping Eu2+ as sensitizer. This work provides a new strategy for discovering new broadband NIR phosphors using Mn2+ in strong crystal field as luminescence center. 相似文献
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Vural E. Kafadar Tuncay Yeşilkaynak Ruken Esra Demirdogen Awara A. Othman Fatih Mehmet Emen Selma Erat 《International Journal of Applied Ceramic Technology》2020,17(3):1453-1459
The thermoluminescence (TL) properties of barium silicate phosphor, Ba2SiO4:%3Dy3+ synthesized by using hydrothermal method were investigated and presented in detail. The crystallographic structure of Ba2SiO4:%3Dy3+ was determined by conventional x-ray diffraction technique and the results showed that the sample was grown in orthorhombic phase with Pmcn (62) space group (PDF: 01-077-0150). The excitation spectra of Ba2SiO4:Dy3+ were measured in the wavelength range of 220-400 nm and the spectra showed that there were several excitation bands in the sample. The CIE chromaticity coordinates were also calculated from emission spectra for Dy3+-doped Ba2SiO4. In order to calculate the kinetic parameters of the sample the additive dose, peak shape and computerized glow curve deconvolution methods were used. It was found that Ba2SiO4:Dy3+ was composed of five general order TL glow peaks. The fading characteristics of the sample were also studied over a period time. At the end of the planned storage times, the normalized TL peak area of Ba2SiO4:Dy3+ reduced 60% of its original value. 相似文献
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Yuanyuan Liu Wen Shi Dongliang Liao Xiongyu Yang Jing Gao Zhijiang Ma Jiang Guo Ning Gong Lu Liu Mingxin Chang Bin Deng Ruijin Yu 《Journal of the American Ceramic Society》2021,104(11):5966-5980
In this study, Sm3+-doped double-perovskite Mg2InSbO6 phosphors were synthesized via high-temperature solid-state reaction. Mg2InSbO6 belongs to the double-perovskite family with a space group of R (No.148). The photoluminescence (PL) spectrum illustrates that Mg2InSbO6:0.05Sm3+ phosphor can emit intense orange-red emission light at 607 nm due to the 4G5/2→6H7/2 transition. The optimum concentration of Mg2InSbO6:xSm3+ is confirmed to 0.05 mol. The asymmetric ratio (4G5/2→6H9/2/4G5/2→6H5/2) of Mg2InSbO6:0.05Sm3+ phosphor is 2.73. The quenching temperature exceeds 500 K, illustrating that Mg2InSbO6:Sm3+ sample has excellent heat resistance. The high color purity and correlated color temperature (CCT) of Mg2InSbO6:Sm3+ phosphors are obtained. Furthermore, a white light-emitting diode (w-LED) is successfully fabricated, possessing CCT of 6769 K and high color rendering index (Ra) of 89. Therefore, the orange-red-emitting Mg2InSbO6:Sm3+ phosphors exhibit great potential to apply in solid-state lighting fields. 相似文献