SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Kang Cheng,Xinyue Liu,Qin Lu,Dongni Wu,Weichao Huang,Chaoyong Deng
Cr 3+ -free near-infrared (NIR) phosphors are currently gaining significant attention in various application fields. A novel Fe 3+ -activated LiAlO 2 NIR phosphor was successfully synthesized by high-temperature solid-state method. Under excitation of 391 nm and 467 nm, the phosphor emits near-infrared light with wavelengths ranging from 600 to 850 nm. The emission bands with peaks at 725 nm correspond to the transition from 4 T 1 ( 4 G) to the ground state energy level 6 A 1 ( 6 S). The optical band gap of LiAlO 2 was calculated using Density Function Theory (DFT) and diffuse reflectance spectrum, respectively. The thermal stability of the sample was measured under 391 nm and 467 nm excitation, showing that the emission intensity at 413 K is 55.3 % and 52.4 % of the emission intensity at room temperature .
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
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2020
·Vol. 8
·期 40
·14100-14108
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IF 7.059
Zhihao Zhou,Xiaodong Yi,Puxian Xiong,Xingyi Xu,Zhijun Ma,Mingying Peng
Near-infrared (NIR) persistent luminescence (PersL) materials have recently evoked considerable interest in the field of biomedicine, but the choices of efficient emitters for NIR PersL phosphors are rather limited. Herein, we report a new class of Fe3+-activated NIR PersL phosphor based on the LiGaO2 host, which exhibits an intense NIR PersL at around 748 nm and possesses an ultra-long PersL time of much longer than 26 h. The optical properties of this phosphor as well as the trapping and de-trapping processes, the trap characteristics, and the underlying PersL mechanism are comprehensively studied by means of photoluminescence (PL), PersL, electron paramagnetic resonance (EPR), thermoluminescence (TL), and X-ray photoelectron spectroscopies (XPS). It was found that the NIR PersL in this material is closely related to the oxygen vacancies. Furthermore, the penetration experiments and cytotoxicity tests of the biological tissue show that this material has great potential for bioimaging applications. Our achievement in the case of nontoxic Fe3+-activated LiGaO2 phosphors lays the foundation for the future design of Cr3+-free PersL phosphors with efficient NIR PersL towards versatile bioapplications.
研究领域:
材料科学
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生物医学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Minzhong Li,Yahong Jin,Lifang Yuan,Bo Wang,Haoyi Wu,Yihua Hu,Feng Wang
The advent of near-infrared (NIR) afterglow in Cr3+-doped materials has stimulated considerable interest in technological applications owing to the sustainable emission of light with good penetrability. However, the development of Cr3+-free NIR afterglow phosphors with high efficiency, low cost, and precise spectral tunability is still an open question. Herein, we report a novel Fe3+-activated NIR long afterglow phosphor composed of Mg2SnO4 (MSO), in which Fe3+ ions occupy the tetrahedral [Mg–O4] and octahedral [Sn/Mg–O6] sites, giving rise to a broadband NIR emission spanning 720–789 nm. On account of energy-level alignment, the electrons released from the traps show a preferential return to the excited energy level of Fe3+ in tetrahedral sites through tunneling, leading to a single-peak NIR afterglow centered at 789 nm with a full-width at half-maximum (fwhm) of 140 nm. The high-efficiency NIR afterglow, showing a record persistent time lasting over 31 h among Fe3+-based phosphors, is demonstrated as a self-sustainable light source for night vision applications. This work not only provides a novel Fe3+-doped high-efficiency NIR afterglow phosphor for technological applications but also establishes practical guidance for rational tuning of afterglow emissions.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Yongjie Wang,Qingzhou Bu,Dongshuo Li,Shuai Yang,Li Li,Guotao Xiang,Sha Jiang,Ying Chang,Chuan Jing,Xianju Zhou,Lev-Ivan Bulyk,Andrzej Suchocki
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) are compact light sources of great interest for NIR spectroscopy applications. Beyond typical Cr 3+ -activated NIR-emitting phosphors, there exists a strong demand for Cr 3+ -free alternatives with high efficiency and broadband emission to rich the landscape of NIR luminescent materials and extend their range of application fields. Here, we report a series of Fe 3+ -activated Ca 3 Ga 2 Sn 3 O 12 garnet-type phosphors exhibiting broadband NIR emission in the 650–1000 nm range attributed to 4 T 1 (G) → 6 A 1 (S) transition, with a maximum at 754 nm and a FWHM of 89 nm upon UV excitation. The spectroscopic results were analyzed according to the Tanabe-Sugano theory from which the crystal field parameter D q and Racah parameters B and C were obtained for the octahedrally coordinated Fe 3+ ion. Notably, the NIR persistent luminescence lasting over 1 h was detected following UV or X-ray irradiation. The possible mechanism involving electron traps was proposed to explain the observed persistent luminescence. Furthermore, a NIR pc-LED was fabricated by coating synthesized phosphor on a UV chip, and its performance was evaluated to assess its potential suitability as a NIR light source. Our discovery of novel type of nontoxic Fe 3+ -activated broadband NIR luminescence phosphors with efficient NIR persistent luminescence paves the way for discovering Cr 3+ -free multifunctional NIR luminescence materials, thereby expanding their application possibilities.
研究领域:
材料科学
·
光学
·
光电子学
✓ 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）