CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Junwei Zhang,Hui Lin,Wenhui Lou,Ruijin Hong,Zhaoxia Han,Dawei Zhang
Photo-stimulated luminescence materials have shown significant potential in the field of information storage, but they still face critical challenges in the regulation of trap levels. Herein, Ba 0.75 Al 11 O 17.25 :Eu 2+ fluorescent ceramics with abundant deep traps (1.24 eV) were reported via selective Mn 2+ co-doping. This material exhibits a homogeneous and dense crystalline structure, and its narrow-band emission at 514 nm is attributed to the energy transfer of Eu-Mn. Thermoluminescence curves, X-ray photoelectron spectroscopy and electron paramagnetic resonance spectra confirm that the trap levels primarily arise from oxygen vacancies and Reidinger defects, and Mn 2+ doping suppresses the formation of shallow traps through charge compensation mechanism. Significantly, information writing and reading in the ceramic medium were achieve using 254 nm UV light and 980 nm NIR light or thermal stimulation. The excellent photo-stimulated luminescence properties and high read-write stability of Ba 0.75 Al 11 O 17.25 :Eu 2+ , Mn 2+ are expected to accelerate the development of the next generation of optical storage technology.
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
Optical Materials Express
·
2022
·Vol. 12
·期 3
·981-990
·
IF 3.074
Tao Long,Xiaomeng Yin,Hui Lin,Cheng Zou,Dawei Zhang,Songlin Zhuang
Cr3+ doped Ba0.75Al11O17.25 red luminescent phosphors were synthesized and densified into ceramics by spark plasma sintering. Under the 405 nm excitation, the phosphors present a narrow band emission peaked at 704 nm and the highest emission intensity when the doping concentration of Cr3+ is 3%. When the temperature reaches 205 °C, the integrated emission intensity of the red emission can still reach 88% of the counterpart at room temperature, showing good luminescence thermal stability. The thermal conductivity of the ceramics is 4.87 W/(m·K) at room temperature, which is good for heat release under high power/high brightness excitations.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Zixin Wang,Hui Lin,Dawei Zhang,Ruijin Hong,Yanna Tian,Jie Chen,Shengming Zhou
In this paper, Ba 0.75 Al 11 O 17.25 was selected as the host for the Eu 2+ and Mn 2+ co-dopants due to the Reidinger defects in its lattice. Upon the 365 nm excitation, the phosphors presented the cyan to green tunable emission by changing the doping concentration of Mn 2+ . Moreover, this phosphor possesses zero-thermal quenching up to 448 K due to the interaction between the traps and Eu 2+ /Mn 2+ . The completely densified ceramic guaranteed the high optical transmittance (∼72 % at 516 nm) and thermal conductivity (4.3 W·m −1 ·K −1 at room temperature). When combined with a 6 W commercial 365 nm emitting LED chip, the temperature of the ceramic eventually stabilized at 428 K and the luminous efficacy of the LED device was almost not influenced by the thermal quenching effect. This work may open a way for exploring new phosphor conversion materials for HP/HB PC solid state lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2026
·
IF 9.6
Junwei Zhang,Hui Lin,Yang Tang,Ruijin Hong,Zhaoxia Han,Changyu Lu,Dawei Zhang,Jianren Xu
Inorganic luminescent materials play a critical role in the fields of multimodal anti-counterfeiting. Although integrating multiple luminescence modes into a single matrix is considered a feasible strategy, it still faces significant challenges such as the regulation and identification of trap levels. Herein, Ba 0.75 Al 11 O 17.25 :Eu 2+ ,Yb 3+ ,Er 3+ phosphors integrating multiple luminescence modes, including afterglow, up-conversion luminescence (UCL), photo-stimulated luminescence (PSL), and thermoluminescence (TL) were developed. Importantly, the introduction of the Yb 3+ /Er 3+ ion pair not only suppresses the concentration of shallow traps but also induces the formation of numerous deep traps (1.62 eV), which are essential for multimodal luminescence and enhance the thermal stability of the luminescence. Furthermore, through comprehensive analysis of density functional theory (DFT) calculation, TL curves, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS), it is confirmed that the trap levels primarily originate from oxygen vacancies and interstitial aluminum. Finally, a highly stable flexible film was fabricated, whose emission intensity and color can be controlled by external light/thermal stimuli, and its applications in anti-counterfeiting and information encryption are demonstrated. This work facilitates the research on advanced luminescent materials and traps regulation mechanisms.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Photonics Research
·
2022
·Vol. 3
·期 9
·2200069
·
IF 0
Congcong Huang,Decai Huang,Shouliang Xu,Jingrong Zhang,Sisi Liang,Jie Hu,Kunyuan Xu,Dejian Chen,Haomiao Zhu
The discovery of Eu 2+ -activated narrowband green phosphor is pivotal for wide gamut liquid crystal displays (LCDs) but facing a great challenge due to the broadband emitting nature of Eu 2+ ions. Alternatively, Mn 2+ ions can generate extremely narrow green emission band but suffering from their weak absorption. Herein, Eu 2+ ions with strong absorption are used to sensitize Mn 2+ ions in the Ba 0.75 Al 11 O 17.25 host. The Mn 2+ ions exhibit a green emission band peaked at 515 nm with an extremely narrow bandwidth of 27 nm. More importantly, the Eu 2+ ions show strong absorption at 340–380 nm and a blue emission band peaked at 450 nm with a relatively narrow bandwidth of 51 nm. Thus, the Ba 0.75 Al 11 O 17.25 : Eu 2+ , Mn 2+ phosphor can be used as a dual narrowband blue and green emitting phosphor with commercial ultraviolet diode chips excitation. Moreover, this phosphor exhibits impressive overall performance that fulfills the key standards of commercial phosphors, including high emission efficiency, excellent photoluminescence thermal stability, and outstanding chemical stability. The packaged light-emitting diode (LED) using 365 nm chips, Ba 0.75 Al 11 O 17.25 : Eu 2+ , Mn 2+ and K 2 TiF 6 :Mn 4+ phosphor generates a ultrawide color gamut of 121% National Television Systems Committee (NTSC) in Commission Internationale de l'Eclairage 1931 (CIE 1931).
研究领域:
材料科学
·
光电子学
·
荧光粉化学
·
显示技术
·
固态照明
✓ 已验证
DOI
危险品化学品经营许可证（带存储）