PHYSICA B-CONDENSED MATTER
·
2023
·
IF 2.8
Wang Bo-Hao,Dan Zhao,Zhang Rui-Juan,Yao Qing-Xia,Jia Lei
Developing new phosphors is an important issue for white LED applications. Herein, a simple compound NaAlO 2 with an unusual compact 5-coordinated [NaO 5 ] polyhedral environment is selected as host material. After doping Bi 3+ into NaAlO 2 , Bi 3+ may be occupy the Na-sites and interesting luminescent properties are expected. Experimental results show that phosphor NaAlO 2 :Bi 3+ can emit cyan light under near-UV excitation. More exciting, the luminescent intensity of NaAlO 2 is rather stable under high temperatures, which is due to the good structural rigidity of NaAlO 2 host lattice and the process of trap-to-activator energy transfer. At 450 K, the typical working condition of LED devices, the PL intensity constitutes 92 % of the intensity at 300 K, which can guarantee its luminous efficiency for applications in LED devices. Finally, a white LED was fabricated by using a 365 nm LED ship, and a mixture of CaAlSiN 3 :Eu 2+ (red phosphor), BaMgAl 10 O 17 :Eu 2+ (blue phosphor) and NaAlO 2 :0.007Bi 3+ . The CIE coordinates, rendering index (Ra) and Correlated Color Temperature (CCT) of this lamp are (0.3183, 0.3307), 96.8 and 4429 K. This work confirms that the NaAlO 2 :Bi 3+ material is a promising cyan phosphor for applications in LED field.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yu-Xi Bi,Dan Zhao,Shao-Jie Dai,Rui-Juan Zhang,Qing-Xia Yao
Ion doping is one of the most effective strategies to induce interesting luminescence properties of materials. In this work, the Bi 3+ and Eu 3+ are introduced into a ‘114’ host material YBaZn 3 GaO 7 (YBZG) to generate photoluminescence (PL), long-persistent luminescence (LPL) and colour change properties. The co-doped YBZG:0.003Bi 3+ / y Eu 3+ can generate multi-color emissions from green, through yellow to orange with the increasing of Eu 3+ concentration. There are F-like color centers around conduction band (CB) of YBZG host with shallow or deep energy levels. The electrons trapped by deep levels response to the PC properties, whereas these for shallow levels response to the LPL properties. The PC process from white to apricot is reversible. By alternating thermal treatment and irradiation, YBZG:0.003Bi 3+ was proved to have a good fatigue resistance of 3.1 %. For YBZG:0.003Bi 3+ /0.05Eu 3+ , it shows bright orange LPL emission when the irradiation is removed after 24 min. The achievement of this paper provides a design idea that if the host structure of a phosphor is of flexible and easy to occur defect, not only PL property, but also PC and LPL properties are probably able to realize.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2019
·
IF 0
Wei Yan,Shuoting Chen,Yixin Liu,Zhiyu Gao,Yi Wei,Guogang Li
High-performance and thermally stable phosphors play an important role in high-quality white light-emitting diode (pc-WLED) lighting. In this work, we proposed a cation substitution strategy to improve the luminescence performance of blue-emitting Bi3+-doped Ca4ZrGe3O12 (abbreviated as CZGO) phosphor. As expected, the introduction of Sr2+ and Si4+ can improve photoluminescence intensity and thermal stability. The photoluminescence intensity can be increased by 6.7 times. The internal quantum efficiency (IQE) can achieve 88.1%. Based on Rietveld refinement results, the corresponding enhancement mechanism is ascribed to the local lattice modification and the improved structure rigidity. In addition, controllable color tuning from blue to red light is successfully realized through designing Bi3+ → Eu3+ energy transfer. The energy transfer efficiency (ηT) is 0.55 in CZGO:2% Bi3+, 15% Eu3+ phosphor. The energy transfer mechanism is discussed in detail. The prototype pc-WLEDs with blue/red dual-emitting CZGO:2% Bi3+, 10% Eu3+ possess a high color rendering index (CRI = 90.8) and low correlated color temperature (CCT = 4372 K). The above investigations indicate that CZGO:Bi3+ and CZGO:Bi3+, Eu3+ are promising blue-to-red tunable phosphor candidates for pc-WLED applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hang Zhang,Hang Yang,Guogang Li,Shiqi Liu,Haoran Li,Yuming Gong,Yujun Liang,Yongjun Chen
Currently, phosphor materials play an important role in designing noncontact remote optical thermometers. Although many approaches have contributed to improve thermometric performance of optical thermometers including optimization of host materials, size of nanoparticles , dopant type and concentration as well as excitation density and phonon energy engineering, the development of highly sensitive optical thermometric materials is still a challenge. Hence, we developed novel CaNb 2 O 6 (CNO):Ln 3+ (Ln 3+ = Eu 3+ /Sm 3+ /Dy 3+ /Tb 3+ ) phosphors as highly thermometric materials and proposed a novel strategy for further enhancing its thermometric performance via adding the intensity of indicator signal by co-doping Bi 3+ ions in current phosphor system. Typically, the as-prepared CNO:Ln 3+ phosphors present a broad blue emission around 470 nm originated from NbO 6 octahedral groups and some respective emission lines derived from the characteristic f-f transitions of Ln 3+ ions. Based on the diverse thermal quenching performance between blue emission and Ln 3+ ions emission , the temperature sensitivities of CNO:Ln 3+ were investigated in detail. Among them, the maximum relative sensitivity of CNO:Eu 3+ sample reached 1.991% K −1 in the range of 298–448 K and remained 97% after five temperature cycles. Furthermore, an obvious discoloration was discovered during temperature cycle testing in CNO:Ln 3+ samples under 254 nm UV lamp. Through doping Bi 3+ ion, the strongest intensity of indicator signal is 24 folds that of CNO host. Correspondingly, the relative sensitivity of CNO:Bi 3+ , Eu 3+ sample is obviously improved to 3.793% K −1 in the range of 298–523 K, owing to a larger range of the FIR value and a wider drop range of indicator signal. This work opens up an effective pathway to improving thermometric performance of optical thermometers by enhancing the intensity of indicator signal of employed phosphor materials.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Xiaoli Li,Yonglei Feng,Liwei Wang,Xianke Sun
A few of Bi 3+ /Mn 2+ doped Ba 9 La 2 Si 6 O 24 phosphors were synthesized in air by the solid state reactions at 1400 °C for the purpose of investigating their possible uses in the light-emitting diodes. The phase and luminescence performance were surveyed using the X-ray diffractometer and spectrometer, respectively. The results demonstrate the single phase and absorbance to the ultraviolet light of the synthesized phosphors. There is the Bi 3+ → Mn 2+ energy transfer, which gives rise to the tunable luminescence of the Bi 3+ /Mn 2+ codoped Ba 9 La 2 Si 6 O 24 phosphors. Upon the ultraviolet light excitation, the white light is generated by the Ba 9 La 2 Si 6 O 24 :0.03Bi 3+ /0.02Mn 2+ and Ba 9 La 2 Si 6 O 24 :0.03Bi 3+ /0.03Mn 2+ phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Xiushuai Guan,Shanbiao Jin,Le Liu,Xiya Zhao,Xiaochao Zhang,Changming Zhang,Zhong Li,Caimei Fan
The utilization of oxygen vacancies to modulate the surface properties of catalysts is a powerful way to enhance catalytic activity. In this work, the doping effect of Bi 3+ on the performance of CeO 2−δ (Ce x Bi 1−x O 2−δ ) hybrid nanorods with rich oxygen vacancies for the photo-thermal synthesis of dimethyl carbonate (DMC) from CO 2 /CH 3 OH (140 ℃, 1.6 MPa, 4 h) is systematically investigated. It is found that Ce 0.9 Bi 0.1 O 2−δ exhibits the best catalytic performance, achieving a photo-thermal yield of 3.13 mmol∙g −1 without any dehydrating agent (1.14 times compared to thermal catalysis). It turns out that regulating the concentration of Bi 3+ ions not only modifies the oxygen vacancy content, but also improves the light harvesting efficiency. Moreover, a series of characterization techniques, such as X-ray photoelectron spectroscopy, Raman spectrometer and electron paramagnetic resonance are employed to analyze and verify that the asymmetric oxygen vacancies are conducive to the improvement in the CO 2 adsorption-activation. Finally, a possible reaction mechanism model of Bi 3+ doping on CeO 2−δ for the photo-thermal synthesis of DMC from CO 2 and CH 3 OH is proposed. This work provides a practical approach to catalyst surface engineering design.
研究领域:
材料科学
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催化化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zishuo Yi,Peng Liu,Yan Xu
Optical storage technology for information encryption is a popular means of safeguarding information. Herein, a Bi3+-activated ZnGa2O4 multimode dynamic photoluminescence (PL) material is developed. Upon being irradiated with an ultraviolet lamp at a fixed excitation wavelength of 254 nm, the ZnGa2O4: x% Bi3+ (x = 0.5–5.0) samples exhibit varying degrees of dynamic PL emission due to a distinct Bi3+ doping effect. The mechanism underlying the dynamic PL of ZnGa2O4: Bi3+ associated with Bi3+-activated trap concentration modulation is investigated using thermoluminescence spectra. Additionally, the ZnGa2O4: 5% Bi3+ sample shows a reversible thermally responsive dynamic PL with a color variation from blue to red upon heating from 283 to 393 K. Predesigned procedures based on single-wavelength-mediated photochromic and thermochromic dynamic PL emissions of ZnGa2O4: Bi3+ are designed for rewritable optical data storage and high-level information encryption. Also, an enhanced encryption scheme with a mask encoding technique applying a ZnGa2O4: Bi3+ hybridized polyvinylidene difluoride film is then proposed to increase the security level. Accordingly, this work provides a feasible way to rationally design dynamic PL material offering more creative designs for safeguarding information via encryption.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jiamei Song,Xinyu Zhang,Ninglei Huang,Hongjian Dou,Bo Chen,Xiuna Tian,Changjun Wang,Lingyuan Wu
A zincate material, BaLa 2 ZnO 5 was successfully synthesized by a high-temperature solid-state method as a host for Bi 3+ . All the peaks in the X-ray diffraction patterns of the obtained material could be attributed to single phase BaLa 2 ZnO 5 . The BaLa 2 ZnO 5 host exhibited strong band-to-band absorption in the range of 200–290 nm. After the doping of Bi 3+ , the absorption band due to band-to-band transition decreased, and three new absorption bands appeared. Upon monitoring the luminescence of Bi 3+ at 407 nm, three excitation peaks were observed for BaLa 2 ZnO 5 : Bi 3+ , which could be attributed to A, C and metal-to-metal charge-transfer states by analyzing its excitation and absorption spectra . When codoped with Bi 3+ and Sm 3+ , BaLa 2 ZnO 5 : Bi 3+ /Sm 3+ exhibited strong energy transfer process from Bi 3+ to Sm 3+ . Variable-temperature emission spectra revealed that the luminescence intensity of Bi 3+ decreases rapidly with the increase in temperature, while that of Sm 3+ ions decreases slowly. The relative sensitivity ( S R ) values of the BaLa 2 ZnO 5 : Bi 3+ and BaLa 2 ZnO 5 : Bi 3+ /Sm 3+ phosphors to temperature (1.77 and 1.12% K −1 , respectively) were high and extremely stable in the range of 293–423 K. Therefore, the Bi 3+ -doped BaLa 2 ZnO 5 phosphor has great application potential for biological temperature sensing.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 44
·16670-16678
·
IF 8.067
Peishan Shao,Puxian Xiong,Yao Xiao,Qianyi Chen,Yongsheng Sun,Na Yan,Dongdan Chen,Zhongmin Yang
Mechanoluminescent (ML) materials, which can emit light under external mechanical stimuli, have attracted much interest in diverse applications such as stress sensing, anti-counterfeiting and 3D signatures. However, ML materials located within the ultraviolet (UV) spectral range are still limited. In this study, a series of LixY0.995GeO4:0.005Bi3+ (0.898 ≤ x ≤ 1.003) samples are synthesized by a high temperature solid-state reaction method. The crystal structure, ML, persistent luminescence (PersL) and photoluminescence (PL) are systematically studied. The excellent UVA PersL of LiYGeO4:Bi3+ can be ascribed to the existence of abundant trap sites created by the intentional loss of Li+ ions, which can improve the ML properties of the phosphors. This excellent material can make up for the deficiency of PersL materials in the UVA region (315–450 nm), and it may greatly expand the application of ML materials in the biomedical, energy and catalysis fields.
研究领域:
材料科学
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光学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Guang-Xuan Zhang,Qiao-Yun Yin,Bing Wang,Li-Ying Liu,Li-Yuan Chang,Ru-Zhi Wang
All-inorganic lead-containing perovskites have shown strong luminescence, but the use of lead has hindered their commercial development due to its stability and toxicity. In this paper, we propose thermal precipitation in ionic liquids (ILs) for synthesizing Bi 3+ -doped Cs 2 ZrCl 6 double perovskites (Cs 2 ZrCl 6 :Bi 3+ (ILs)), which have a better crystallinity compared to the Cs 2 ZrCl 6 :Bi 3+ (HCl) synthesized by the traditional hydrochloric acid method. Most interestingly, the Cs 2 ZrCl 6 :Bi 3+ (ILs) exhibits ultra-high photoluminescence quantum yield (PLQY) of up to 78.52%, which is about three times higher than the Cs 2 ZrCl 6 :Bi 3+ (HCl) prepared by the traditional method. In addition, the PLQY of this paper is the highest in the reported works for the Cs 2 ZrCl 6 :Bi 3+ . It has been confirmed that the high PLQY of Cs 2 ZrCl 6 :Bi 3+ (ILs) is due to the interaction force between N atoms and perovskites in ionic liquid cations, and the cations in ionic liquids can improve the crystallinity of Cs 2 ZrCl 6 :Bi 3+ (ILs) double perovskite crystallites by passivating shallow defects. The research provides an alternative and efficient method for synthesizing stable lead-free double perovskites with good optical properties.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shenghui Zheng,Yafang Chen,Kaihui Lin,Liting Qiu,Zhixia Zheng,Yiqing Cao,Yuda Lin
X-ray Stimulated ultraviolet (UV) persistent luminescence (PersL) materials are considered the optimal choice for optical imaging in X-ray imaging encryption applications due to their excitation source and emission spectra being invisible to the human eyes. However, the efficiency of X-ray excited UV PersL materials are currently limited, particularly when compared to those excited by UV. There is a need to develop UV PersL materials that can be efficiently excited by X-ray. Here we present a novel UV PersL material YBO 3 :Bi 3+ ,Li + , which exhibits high efficiency after X-ray excitation and holds promise for applications in X-ray image encryption. Through optimization of Bi 3+ concentration and addition of Li + , YBO 3 :Bi 3+ ,Li + demonstrates the capability to emit UV PersL at 326 nm after X-ray excitation, lasting for over 40 h. In addition, the experimental characterization also revealed that YBO 3 :Bi 3+ ,Li + have excellent photo-stimulated luminescence effects on white light, red light and near-infrared light sources. Furthermore, the proposed dual-mode detection capabilities demonstrate a high level of confidentiality in X-ray encryption imaging applications by leveraging excellent UV PersL performances and utilizing short time X-ray excitation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 6
·6188-6192
·
IF 1.798
Wu Yeqiu,Jin Guangya,Liu Zhijian,He Tao
Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ /Bi 3+ particles with spherical morphology are synthesized by microwave-assistant hydrothermal process. The results show that cubic phase Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ /Bi 3+ particles with uniform size and spherical shape are obtained. The doping Eu 3+ and Bi 3+ ion have no influence on the phase and morphology of samples. In the hydrothermal process, the fast and homogeneous microwave heating benefits the formation of samples with uniform size and spherical shape. Both Y 2 O 3 :Eu 3+ and Y 2 O 3 :Eu 3+ /Bi 3+ show dominant red emission originating from the 5 D 0 → 7 F 2 transition of Eu 3+ . The codoping Bi 3+ can enhance the intensity of Eu 3+ emission.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）