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1.
Zheng Lu Dashuai Sun Zeyu Lyu Sida Shen Pengcheng Luo Shuai Wei Luhui Zhou Hongpeng You 《Journal of the American Ceramic Society》2023,106(11):6617-6629
A series of LaCaGaO4:xBi3+,yEu3+ (x = 0.002–0.04, y = 0.02–0.45) phosphors with adjustable emission colors were synthesized by high-temperature solid-state reaction. The samples were identified as pure phases by X-ray diffraction and Rietveld refinement, and the crystal structures were analyzed in detail. The LaCaGaO4:xBi3+ phosphor shows an intense blue emission under near-ultraviolet excitation, originating from the 3P1 → 1S0 transition. The spectrum analysis reveals that the Bi3+ ions occupy two luminescence centers in the LaCaGaO4 host and that energy transfer can occur. A model of the energy transfer between the Bi3+ and Eu3+ ions was also created and studied in detail. As the Eu3+-concentration increased, the emission color of the LaCaGaO4:0.005Bi3+,yEu3+ phosphor changed from blue to pink to red. In addition, the fluorescence lifetime, quantum yield, thermal stability, and other properties of the phosphors were characterized and analyzed. Finally, two white light-emitting diode devices with Ra values of 96.6 and 95 and correlated color temperatures of 4578 and 3324 K were fabricated, indicating the potential of phosphors for warm white lighting applications. 相似文献
2.
Tunable emission color of Li2SrSiO4:Tb3+ due to cross‐relaxation process and optical thermometry investigation
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Xiao Zhou Sha Jiang Guotao Xiang Xiao Tang Xiaobing Luo Li Li Xianju Zhou 《Journal of the American Ceramic Society》2018,101(7):3076-3085
A series of Li2SrSiO4:xTb3+ (0.2%, 0.4%, 0.6%, 0.8%, 2%, 4%, and 6%) phosphors were prepared by conventional solid‐state reaction. It was found that this silicate phosphor has a wide excitation band at near‐ultraviolet region (230‐300 nm) due to spin‐allowed 4f 8→4f75d1 transitions of Tb3+ ions, with the exact position dependent on the crystal field of the lattice. The cross‐relaxation process originating from 5D3→5D4 and 7F6→7F0 happened between different Tb3+ ions. It leads to the luminescence color of Li2SrSiO4: xTb3+ tuning from blue to green just by controlling Tb3+ concentrations. Furthermore, concentration quenching mechanism, energy migration type, cross‐relaxation rate and efficiency, are discussed in detail. Finally, optical thermometry properties were investigated via temperature‐dependent emission spectra. The results show that low‐concentration‐doped sample (Li2SrSiO4:0.4%Tb3+) shows remarkable optical thermometry based on fluorescence intensity ratio (FIR) between the blue and green emission of Tb3+ ions, whereas the high‐concentration‐doped sample (Li2SrSiO4:4%Tb3+) demonstrates small emission intensity loss. It illustrates that terbium‐doped silicate phosphor is a multifunctional material with potential application for display field and optical thermometry . 相似文献
3.
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
4.
DanYu Zhang YuXuan Luo ShuJun Xu LianJie Li JunYu Chen Lei Lei Hai Guo 《Journal of the American Ceramic Society》2023,106(10):5887-5897
In this paper, Y4GeO8:Bi3+,Eu3+ phosphor with dual emission centers was elaborated via conventional solid-state reaction technology. Thorough research on the structure, morphology, and luminous properties of Y4GeO8:Bi3+,Eu3+ phosphor, the potential applications in optical thermometry were investigated by means of fluorescence intensity ratio and thermochromic techniques. Under 290 and 347 nm excitation, Y4GeO8:Bi3+,Eu3+ phosphor presents broadband emission from 3P1 → 1S0 transition of Bi3+ ions and characteristic emission peaks from 4f–4f transition of Eu3+ ions. Outstanding temperature-sensing capabilities are acquired from Y4GeO8:Bi3+,Eu3+ phosphor. The maximum relative sensitivity (Sr) can attain 1.51% K−1 (λex = 290 nm). With temperature raising (303–513 K), the emitted color of Y4GeO8:Bi3+,Eu3+ phosphor (λex = 290 nm) shifts from faint yellow to red with a high chromaticity shift (0.180), which can be distinguished by the unaided eye clearly. Our results indicate that Y4GeO8:Bi3+,Eu3+ phosphor has potential applications in optical temperature measurement and high-temperature safety marker. 相似文献
5.
《Ceramics International》2017,43(18):16323-16330
The tricolor-emitting MgY4Si3O13: Ce3+, Tb3+, Eu3+ phosphors for ultraviolet-LED have been prepared via a high-temperature solid-state method. X-ray diffraction, photoluminescence emission, excitation spectra and fluorescence lifetime were utilized to characterize the structure and the properties of synthesized samples. Two different lattice sites for Ce3+ are occupied from the host structure and the normalized PL and PLE spectra. The emissions of single-doped Ce3+/Tb3+/Eu3+ are located in blue, green and red region, respectively. The energy transfer from Ce3+ to Tb3+ and from Tb3+ to Eu3+ has been validated by spectra and decay curves and the energy transfer mode from Tb3+ to Eu3+ was calculated to be electric dipole-dipole interactions. By adjusting the content of Tb3+ and Eu3+ in MgY4Si3O13: Ce3+, Tb3+, Eu3+, the CIE coordinates can be changed from blue to green and eventually generate white light under UV excitation. All the results indicate that the MgY4Si3O13: Ce3+, Tb3+, Eu3+ phosphors are potential candidates in the application of UV-WLEDs. 相似文献
6.
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
7.
Synthesis and luminescence study of Zn3V2O8: Bi3+ yellow phosphor for solar spectral conversion
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Xinguo Zhang Anxiang Guan Liya Zhou Menglian Gong 《International Journal of Applied Ceramic Technology》2017,14(3):392-398
A yellow phosphor Zn3V2O8: Bi3+ was synthesized by solid‐state method. It can efficiently absorb UV photons of 250‐400 nm, and convert into strong yellow emission with maximum at 550 nm, which can be absorbed by dye‐sensitized solar cells (DSSCs). VO4→Bi3+ energy transfer is discussed. The critical Bi3+ concentration is 0.04 with critical distance of 13.25 Å. The CIE coordinates of Zn3V2O8: Bi3+ are (0.421, 0.518). Zn3V2O8: Bi3+ phosphor exhibits good thermal stability with T1/2=150°C. The results indicate that Zn3V2O8: Bi3+ phosphor is a promising UV‐absorbing spectral converter to enhance power conversion efficiency and photochemical stability of DSSCs. 相似文献
8.
以Na2CO3为电荷补偿剂,采用高温固相法合成了碱土氯硅酸盐Sr8Si4O12Cl8:(Eu3 M3 )(M=Bi3 ,Gd3 )荧光材料.X射线衍射分析结果表明:合成的Sr8Si4O12Cl8:(Eu3 ,M3 )为纯四方相.Eu3 的发射主峰位于614 nm,为5D0→7F2的电偶极跃迁,表明Eu3 处于非中心对称格位,即取代Sr2 的位置.通过对其激发光谱和发射光谱研究,发现敏化剂Bi3 ,Gd3 的掺入对Eu3 的发射具有较强的敏化作用,当Bi3 和Gd3 的掺杂量(摩尔分数)分别为5.0%时,Eu3 的相对发光强度分别提高了29.4%和23.6%. 相似文献
9.
采用高温固相法在还原气氛下合成了Ca3MgSi2O8:RE(RE=Eu2 ,Ce3 ,Tb3 )系列样品.用荧光光谱仪研究了样品掺杂Eu2 ,Ce3 ,Tb3 后的光谱性质.样品Ca3MgSi2O8:Ce3 在紫外光激发下呈蓝紫色发射;样品Ca3MgSi2O8:Eu2 在紫外光激发下则呈绿色发射.分别讨论了Ce3 ,Eu2 和Ce3 ,Tb3 共激活焦硅酸钙盐在紫外光激发下的光谱特性和其中存在的能量传递机理,发现Ce3 分别对Eu2 和Tb3 有敏化作用. 相似文献
10.
《Ceramics International》2022,48(4):4732-4740
The remote and non-invasive optical thermometer exploiting fluorescence intensity ratio technology is of great importance in various intelligent optoelectronic sensors. Dual-emitting YNbO4:Bi3+, Eu3+ phosphor is synthesized and investigated for the development of temperature sensing materials. The phosphor excited at 318 nm shows a blue broad band emission and several red sharp peaks. The value of Bi3+→Eu3+ energy transfer can reach 98.2% when Eu3+ doping content is 0.14. Benefiting from diverse thermal response behaviors due to Bi3+ and Eu3+ ions completely different electronic configurations, a dual-emitting optical thermometer is designed. The maximum values of absolute and relative sensitivities are as high as 2.51% K?1 at 473 K and 1.43% K?1 at 423 K, respectively. The thermochromic phosphor possesses a great chromaticity shift (ΔE = 317×10?3) with temperature. Based on superior color discriminability, visual colorimetry temperature measurement relied on thermal characteristic is proposed. All the results demonstrate that YNbO4:0.01Bi3+, 0.005Eu3+ phosphor as a sensitive and reliable optical thermometer has great potentials in temperature measurement. 相似文献
11.
White‐emitting phosphor Ba2B2O5:Ce3+, Tb3+, Sm3+: Luminescence,energy transfer,and thermal stability
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Shuchao Xu Zhijun Wang Panlai Li Ting Li Qiongyu Bai Jiang Sun Zhiping Yang 《Journal of the American Ceramic Society》2017,100(5):2069-2080
A series of Ba2B2O5: RE (RE=Ce3+/Tb3+/Sm3+) phosphors were synthesized using high‐temperature solid‐state reaction. The X‐ray diffraction (XRD), luminescent properties, and decay lifetimes are utilized to characterize the properties of the phosphors. The obtained phosphors can emit blue, green, and orange‐red light when single‐doped Ce3+, Tb3+, and Sm3+. The energy can transfer from Ce3+ to Tb3+ and Tb3+ to Sm3+ in Ba2B2O5, but not from Ce3+ to Sm3+ in Ce3+ and Sm3+ codoped in Ba2B2O5. However, the energy can transfer from Ce3+ to Sm3+ through the bridge role of Tb3+. We obtain white emission based on energy transfer of Ce3+→Tb3+→Sm3+ ions. These results reveal that Ce3+/Tb3+/Sm3+ can interact with each other in Ba2B2O5, and Ba2B2O5 may be a potential candidate host for white‐light‐emitting phosphors. 相似文献
12.
Peixin Gao Zeyun Zhou Peng Dong Qian Li Honghui Li Jing Wang Zhi Zhou Mao Xia 《Journal of the American Ceramic Society》2021,104(12):6444-6454
Blue and far-red light play a key role in plant growth, so it is necessary to develop blue and far-red dual emitting phosphors. However, the match between phosphors and plant pigments is not satisfactory. In this work, we synthesized a series of blue and far-red dual emission Gd2MgTiO6: Bi3+, Cr3+ (GMTO: Bi3+, Cr3+) phosphors and discussed the luminescence performance. The blue emission at 430 nm is ascribed to 3P1 → 1S0 transition of Bi3+ and the far-red emission is ascribed to 4T2 → 4A2 and 2E → 4A2 transitions of Cr3+. Notably, because of the energy competition between Cr3+ ions and host materials, the luminescence tuning realized with the content of Cr3+ doping. In addition, an energy-transfer performance occurred from Bi3+ ions to Cr3+ ions and the photoluminescence intensity of Cr3+ can be enhanced by Bi3+. The pc-LEDs devices were synthesized by GMTO: Bi3+, Cr3+ phosphor, and ultraviolet (UV) chips. Finally, the emission of GMTO: Bi3+, Cr3+ phosphor matched well with the absorption spectra of plant pigments which indicated the potential applications in LED plant lamp. 相似文献
13.
Ping Huang Yuye Zhao Jiancheng Wang Yaru Zheng Peng Yang Qi Zheng Shijia Gu Beiying Zhou Wan Jiang Lianjun Wang 《Journal of the American Ceramic Society》2020,103(9):4989-4998
Phosphors-in-glass (PiG), which serves as a potential bi-replacement of both phosphors and organic encapsulants in high-power white light-emitting diodes (WLEDs), has captured much attention due to its high thermal stability and excellent luminescent properties. However, due to the high-temperature sensitivity and the chemical reactions between phosphors with glass matrix, a variety of phosphors, especially red phosphors could be hardly dispersed into the glass without thermal quenching and decomposition, which greatly limits the improvement of color rendering index and chromaticity tunability of the WLEDs. In this study, adopting the mesoporous silica (FDU-12) and commercial phosphors as raw materials, the phosphors-in-silica-glasses (PiSGs) embedded with red phosphor CaAlSiN3:Eu2+ and yellow phosphor YAG:Ce3+ have been successfully prepared at low sintering temperature (950°C) and short preparation time (10 minutes) using spark plasma sintering. Owing to the well preservation of the originally emissive properties of the embedded phosphors, the warm WLEDs with tunable chromaticity and exhibited a superior performance with LE of 133 lm/W, CCT of 3970 K and CRI of 81 were fabricated by encapsulating the as-prepared PiSGs on the blue chips. Moreover, the PiSG composite exhibits a high thermal conductivity up to 1.6 W/m·K. 相似文献
14.
《Ceramics International》2022,48(13):18157-18164
Bi3+/Tb3+/Mn2+-activated SrZnSO phosphors were prepared to investigate their luminescence characteristics. The SrZnSO:Bi3+, SrZnSO:Mn2+ and SrZnSO:Tb3+ phosphors, excited by the NUV/blue light, show blue, orange and green emissions, respectively. The Bi3+ → Tb3+, Tb3+ → Mn2+ and Bi3+ → Mn2+ energy transfer processes take place in Bi3+/Tb3+-, Tb3+/Mn2+-, Bi3+/Mn2+- and Bi3+/Tb3+/Mn2+-activated SrZnSO phosphors, which result in tunable luminescence of these phosphors. The CIE coordinates were calculated on the basis of the emission spectra, and they reflect the emission color changes of phosphors. For the Bi3+/Tb3+-, Tb3+/Mn2+- and Bi3+/Mn2+- activated SrZnSO phosphors, the emission points are located in the cyan, yellow and white light regions, respectively. For the Bi3+/Tb3+/Mn2+-activated SrZnSO phosphors, the light is in warm white light region. 相似文献
15.
WeiHui Song XueYan Chen LiMing Teng ZhiGang Zheng Jun Wen FangFang Hu RongFei Wei LiPing Chen Hai Guo 《Journal of the American Ceramic Society》2019,102(4):1822-1831
Single-composition Ba2Y2Si4O13:Bi3+,Eu3+ (BYSO:Bi3+,Eu3+) phosphors with color-tunable and white emission were prepared by conventional high temperature solid-state reaction method. The structural and luminescent properties of these phosphors were thoroughly investigated through X-ray diffraction, photoluminescence, and decay curves. BYSO:Bi3+ phosphors show two excitation peaks at 342 and 373 nm, and give two emission peaks at 414 and 503 nm, respectively, indicating that there are two sites of Bi3+ in BYSO. The energy transfer from Bi3+ to Eu3+ was investigated in detail. Varied hues from blue (chromaticity coordinate [0.219, 0.350]) to white (0.288, 0.350) and orange-red light (0.644, 0.341) can be generated by adjusting the content of Eu3+. Pure white light emission (0.311, 0.338) can be obtained under the excitation of 355 nm in BYSO:3%Bi3+,20%Eu3+ phosphor. Besides, BYSO:Bi3+,Eu3+ phosphors exhibit distinct thermal quenching properties, whose emission intensity at 473 K is 82.6% of that at 298 K. Our results indicate that BYSO:Bi3+,Eu3+ may be applied as conversion phosphors for n-UV-based W-LEDs. 相似文献
16.
LaF3:Eu nanophosphors were prepared by a traditional hydrothermal method with citric acid as a reducing agent. X-ray diffraction, scanning electronic microscopy, and luminescence spectroscopy were used to study the nanophosphors. The formation of three different luminescence centers of Eu2+ and two different luminescence centers of Eu3+ is attributed to the existence of abundant surface defects in this nanophosphor. Eu3+ is effectively excited by energy transfer from Eu2+ to Eu3+. The excitation wavelength of Eu3+ covers a broad spectral range from 250 to 480 nm. The nanophosphor shows a tunable luminescence color varying from blue to white and then to red, which is explained from three aspects of Eu concentration, energy transfer, and concentration quenching. Utilizing the surface defect of nanoparticles to control the reduction of Eu3+ is considered a promising strategy for exploring Eu2+ and Eu3+ codoped phosphor suitable for the lighting and display application. 相似文献
17.
Ba3Tb(BO3)3:Eu3+的制备与发光性质 总被引:2,自引:1,他引:1
采用高温固相法合成了Ba3Tb(BO3)3:Eu3+红色荧光粉,并研究了Ba3Tb(BO3)3:Eu3+的发光特性。Ba3Tb(BO3)3:Eu3+的激发光谱包含250nm~330nm和350nm~400nm的2个宽带,最大峰值位于383nm,可以被紫外-近紫外发光二极管(light-emitting diodes,LED)有效激发。Ba3Tb(BO3)3:Eu3+的发射谱显示出4组发射峰,其主发射峰位于620nm,对应Eu3+的5D0→7F2跃迁;Eu3+掺杂摩尔分数为2%时,Ba3Tb(BO3)3:Eu3+发光亮度最高。经分析发现Ba3Tb(BO3)3:Eu3+存在Tb3+→Eu3+的能量传递。 相似文献
18.
The Energy Transfer and Thermal Stability of a Blue‐Green Color Tunable K2CaP2O7:Ce3+,Tb3+ Phosphor
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Yi Ding Luxiang Wang Mengjiao Xu Dianzeng Jia Rui Zhou 《Journal of the American Ceramic Society》2017,100(1):185-192
Novel blue‐green emitting Ce3+‐ and Tb3+‐activated K2CaP2O7 (KCPO) luminescent materials were synthesized via a solid‐state reaction method. X‐ray diffraction, luminescence spectroscopy, decay time, and fluorescent thermal stability tests have been used to characterize the prepared samples. The KCPO:Ce3+,Tb3+ luminescence spectra show broad band of Ce3+ ions and characteristic line of Tb3+ ion transition (5D4–7F5). The color variation in the light emitting from blue to green under UV excitation can be obtained by tailoring the Tb3+ content in KCPO:Ce3+. Besides, Ce3+ ions obviously intensify Tb3+ ion emission through an effective energy transfer process, which was confirmed from decay curves. The energy transfer efficiency was determined to be 82.51%. A resonant type mechanism via the dipole–quadrupole interaction can be proposed for energy transfer. As a whole, the KCPO:Ce3+,Tb3+ phosphor exhibits excellent performance in the range from 77 to 673 K, indicating the phosphors are highly potential candidates for solid‐state lighting. 相似文献
19.
《Ceramics International》2017,43(2):1937-1942
A series of emission-tunable Ca3SiO4Cl2:Bi3+, Li+, Eun+(n =2, 3) (CSC:Bi3+, Li+, Eun+) phosphors have been synthesized via sol-gel method. The X-ray diffraction results indicate that the as-synthesized phosphors crystallize in a low temperature phase with the space group of P21/c. Energy transfer from Bi3+ to Eu3+/Eu2+ exists in CSC:Bi3+, Li+, Eun+ phosphors. Under the excitation of 327 or 365 nm, the Ca2.98−ySiO4Cl2:0.01Bi3+, 0.01Li+, yEun+(y=0.0001–0.002) phosphors show an intense green emission band around 505 nm, while under the excitation of 264 nm, three emission bands centered around 396 nm (Bi3+), 505 nm (Eu2+) and 614 nm (Eu3+) are observed and tunable colors from blue-violet to green or white are achieved in these phosphors by varying the content of Eu. White-light emission with the color coordinate (0.312, 0.328) is obtained in Ca2.978SiO4Cl2:0.01Bi3+, 0.01Li+, 0.002Eun+(n =2, 3). Based on these results, the as-prepared CSC:Bi3+, Li+, Eu2+, Eu3+ phosphors can act as color-tunable and single-phase white emission phosphors for potential applications in UV-excited white LEDs. 相似文献
20.
《Ceramics International》2023,49(10):15581-15587
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