Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Yunfei Wang,Sixia Li,Yuzhu Yang,Peng Zhang,Wenfei Qin,Sai Zhou,Xuan Miao,Zenggang Lin,Weisheng Liu
Materials exhibiting long-persistent luminescence (LPL) in the visible spectrum hold pivotal importance for anti-counterfeiting and encryption. Nevertheless, conventional LPL materials generally possess a fixed afterglow color. This constraint makes it imperative to develop multimodal luminescent systems featuring spectrally tunable afterglow. Herein, the Er3+/Sm3+ co-doped Ca3Ga4O9 phosphors achieve multicolor photoluminescence (PL), upconversion luminescence (UCL), and color-tunable LPL by responding to multiple excitations modes ranging from ultraviolet (UV) to near-infrared radiation (NIR). Spectral analysis reveals a green-to-orange multicolor afterglow by varying the relative concentrations of Er3+ and Sm3+ ions. To unravel the mechanism of multicolor afterglow, afterglow spectra and thermoluminescence (TL) spectra are systematically employed to probe the trap distribution mediated by Er3+ and Sm3+ co-doping. Finally, their prospective application in optical anti-counterfeiting and information encryption is also systematically investigated based on the color-tunable LPL. This successful integration of multicolor, multimodal luminescence with color-tunable afterglow in a single host provides a novel platform for anti-counterfeiting and encryption, significantly expanding the visual diversity of displayable information.
研究领域:
材料科学
·
光学物理
·
固体物理
·
发光学
·
防伪技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ying Zhang,Hengxi Yao,Jiawen Fan,Jia Li,Tianyi Wang,Canlin Zhou,Jiawei Yan,Tong Wei,Linyang Li,Dengfeng Peng,Yingdong Han
Mechanoluminescence (ML) materials as a special type of energy conversion medium play an important role in a wide range of fundamental applications. However, in numerous previously investigated ML host systems, effective activation of ML was typically confined to limited types of luminescent centers, seriously restricting the emission spectral diversity form a single system. Additionally, a significant proportion of the ML materials identified to date necessitate pre-irradiation with light to acquire ML capabilities. These limitations considerably restrict the practical application of ML in real-world scenarios. Herein, a mechanical-energy-driven piezoelectric gallate system (Ca 3 Ga 4 O 9 ) was identified as a promising ML matrix due to its non-pre-irradiation activation properties and excellent lanthanide ion holding capacity. Under non-pre-irradiation conditions, tunable and extended ML spectral domain from violet to near infrared was realized in the designed lanthanide ions activated Ca 3 Ga 4 O 9 (Ca 3 Ga 4 O 9 :Ln 3+ ) compounds. Through systematic experimental investigations and theoretical modeling, the underlying mechanism of the ML has been elucidated. It is revealed that the non-pre-irradiation multicolor ML phenomena fundamentally originate from the synergistic contribution of triboelectric and piezoelectric effects. These developed Ca 3 Ga 4 O 9 :Ln 3+ composites based on ML display intriguing potential application in aviation secure channel encryption, allowing security access control encryption with improved security performance.
研究领域:
材料科学
·
光电子学
·
固态物理
·
安全技术
·
应用物理学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2020
·Vol. 8
·期 22
·2001037
·
IF 8.286
Dongjie Liu,Xiaohan Yun,Guogang Li,Peipei Dang,Maxim S. Molokeev,Hongzhou Lian,Mengmeng Shang,Jun Lin
Highly efficient cyan-emitting phosphor materials are indispensable for closing the cyan gap in spectra of the traditional phosphor-converted white light-emitting diodes (WLEDs) to achieve high-quality full-spectrum white lighting. In this work, bright cyan-emitting Ca 3 Ga 4 O 9 (CGO):0.02Bi 3+ ,0.07Zn 2+ phosphor is developed to bridge the cyan gap. Such a Bi 3+ ,Zn 2+ codoping enhances the cyan emission of CGO:0.02Bi 3+ by 4.1 times due to the influence of morphology and size of phosphor particles, charge compensation and lattice distortion. Interestingly, codoping La 3+ ions into the current system can achieve a photoluminescence tuning of CGO:0.02Bi 3+ from cyan to yellowish-green by crystallographic site engineering. Besides, Bi 3+ –Eu 3+ energy transfer is successfully realized in CGO:0.02Bi 3+ ,0.07Zn 2+ , n Eu 3+ phosphors and the emission color tuning from cyan to orange is observed. The investigation of thermal quenching behaviors reveals that the incorporation of Zn 2+ and La 3+ improves the thermal stability of CGO:0.02Bi 3+ . Finally, CGO:0.02Bi 3+ ,0.07Zn 2+ ,0.10Eu 3+ phosphor is employed to obtain a single-phased warm WLED device. A full-spectrum WLED device with remarkable color rendering index (Ra) of 97.4 and high luminous efficiency of 69.72 lm W −1 is generated by utilizing CGO:0.02Bi 3+ ,0.07Zn 2+ phosphor. This result suggests the important effect of CGO:0.02Bi 3+ ,0.07Zn 2+ phosphor on closing the cyan gap, providing new insights of cyan-emitting phosphors applied in full-spectrum white lighting.
研究领域:
材料科学
·
光学工程
·
固体物理
·
无机化学
·
光电子学
·
照明技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Liwei Wu,Jiawen Fan,Hengxi Yao,Tong Wei,Jia Li,Jiawei Yan,Tianyi Wang,Canlin Zhou,Yingdong Han,Linyang Li,Dong Tu,Dongling Geng
Photoluminescence (PL) and mechanoluminescence (ML), serving as core mechanisms of emerging intelligent luminescent materials, hold momentous promise for applications in information security, display technologies, and self-powered sensing. However, conventional intelligent luminescent materials face critical limitations, including the difficulty in constructing multiplexing systems, dependence on ultraviolet (UV) pre-irradiation, and constraints of monochromatic emission. To address these limitations, a series of Er 3+ mediated piezoelectric Ca 3 Ga 4 O 9 :Eu 3+ samples is designed and developed, establishing a four-wavelength-excitation optical multiplexing platform, where each excitation source selectively activated distinct lanthanide energy transfer pathways while enabling tricolor PL tuning from orange-red to yellow to green. Simultaneously, intriguing ML is also achieved, featuring non-pre-irradiation and multicolor (continuous red-to-green emission) tunability characteristics. More importantly, combining systematic experimental investigations and density functional theory calculations, the underlying mechanism of the ML has been elucidated as the synergistic contribution of triboelectric and piezoelectric effects. The developed Ca 3 Ga 4 O 9 :Eu 3+ embellished by Er 3+ displayed intriguing potential application in grayscale analysis anti-counterfeiting films, and self-powered cipher lock system.
研究领域:
材料科学
·
发光材料
·
智能响应材料
·
信息加密
·
自供电系统
·
纳米能源
·
固态物理化学
·
防伪技术
✓ 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）