INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Ying Chen,Rongfei Wei,Lanjiao Li,Xiangling Tian,Fangfang Hu,Hai Guo
High-performance near-infrared (NIR) light sources are highly sought after in advanced spectroscopy techniques, driving the development of NIR phosphor-converted light-emitting diodes (pc-LEDs). Escalating the luminescence intensity and thermal stability of NIR-emitting phosphors, which is a core component of NIR pc-LEDs, is of paramount importance. Herein, chemical unit cosubstitution and cosolvent addition tactics were implemented to simultaneously boost the NIR luminescence performance of the synthesized phosphors. The replacement of [Sc3+-Sc3+] for [Ca2+-Zr4+] in Ca4ZrGe3O12:Cr3+ likely reduces the antisite defects and offers a more rigid crystal structure. As a result, the emitting intensity is reinforced significantly, along with a remarkable improvement in thermal stability, acquiring 65% of the initial luminescence at 423 K compared with 42% for the primal sample. Moreover, the introduction of H3BO3 further enhances NIR luminescence while maintaining a favorable thermal resistance. The encapsulated NIR pc-LED carries an impressive output power of 71.8 mW at 300 mA and a conversion efficiency up to 15.6% at 10 mA. The practical presentations in food checking, imaging, and detection manifest that Ca3.5ScZr0.5Ge3O12:Cr3+,H3BO3 is a promising material for spectroscopy-based technologies.
研究领域:
材料科学
·
光学
·
无机化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 11
·9211-9222
·
IF 3.277
Bei Zhao,Li Yuan,Shanshan Hu,Xuemei Zhang,Xianju Zhou,Jianfeng Tang,Jun Yang
Novel Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors have been synthesized via a one-step hydrothermal route using glycine (Gly) as a surfactant. The phosphors were characterized using X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL), and luminescence decays. It was found that various surfactants had a profound influence on the crystal phase, morphology and emission intensity of the final products. Furthermore, the photoluminescence of Ln3+-doped Sc2Mo3O12 phosphors (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) was studied in detail. The energy transfer of MoO42− → Tb3+ (Dy3+) → Eu3+ and multicolor tunable emission occurred by changing the ratio of Tb3+/Eu3+ or Dy3+/Eu3+ under single wavelength excitation. Moreover, the energy transfer mechanism from Tb3+ (Dy3+) to Eu3+ was ascribed to dipole–dipole interactions and the energy transfer efficiency from Tb3+ to Eu3+ (95.3%) was higher than that from Dy3+ to Eu3+ (87.5%). Their tunable multicolor luminescence properties make Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors suitable for many potential applications in the fields of color displays and fluorescent lamps.
研究领域:
材料科学
·
无机化学
·
纳米材料
·
发光材料
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Sayed Ali Khan,Abdul Jalil,Qudrat Ullah Khan,Rana Muhammad Irfan,Ikhtisham Mehmood,Karim Khan,Maryam Kiani,Binbin Dong,Noor Zamin Khan,Jun-Ling Yu,Ling Zhu,Simeon Agathopoulos
A novel single-phase white-light-emitting YPO 4 phosphor, single and co-doped with Dy 3+ /Eu 3+ , aiming at UV-pumping in white-light-emitting diodes (WLEDs) which exhibits an outstanding optical performance, was successfully produced. The crystal structure, the morphology, the electronic band structure , the electronic configuration, and the bond length of the prepared phosphors were thoroughly investigated, both experimentally and by computational methodology. The results showed that the host lattice provides various surrounding environments to the Eu 3+ activators is a results of Eu 3+ single and Dy 3+ /Eu 3+ co – doped YPO 4 phosphors. Under ultra-violet (UV) excitation (353 nm), the prepared tetragonal phase YPO 4 :Dy 3+ phosphors emitted a bluish-white-light because it has peaks of similar intensity in the blue and the yellow spectral region . The emission spectrum can be tuned from bluish white to green/yellow/red and warm white by adjusting the concentration of Tb 3+ /Eu 3+ dopants . A high photoluminescence quantum yield (PLQYs) 68.55% was achieved. It was observed that the tetragonal YPO 4 :Tb 3+ /Dy 3+ /Eu 3+ phosphors emit-white-light which covers the whole visible region, and have good thermal stability from 20 to 200 °C. Finally, a WLED was fabricated by using a UV LED (365 nm) chip coated with the optimized YPO 4 :Tb 3+ /Dy 3+ /Eu 3+ single-phase phosphor, demonstrating an excellent white-light emission with a high CRI value (R a = 92) and a low CCT value (T c = 2497 K). Hence, the produced material is a promising candidate for UV-pumped single-phase phosphor-converted WLEDs.
研究领域:
材料科学
·
光学工程
·
无机化学
·
固体物理
·
光电子学
·
功能材料
·
照明技术
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Jinsheng Liao,Zhuo Han,Junxiang Huang,Biao Fu,Yijian Sun,Huali Yuan,Herui Wen
This paper reports a new type of PbTiO 3 :Yb 3+ /Er 3+ (PTO:Yb 3+ /Er 3+ ) phosphor synthesized by sol-gel method. Under 980 nm excitation, PTO:Yb 3+ /Er 3+ phosphors exhibited green emission bands centered at 524/549 nm ( 2 H 11/2 / 4 S 3/2 → 4 I 15/2 ) and red emissions 661 nm ( 4 F 9/2 → 4 I 15/2 ). Concentration-dependent upconversion (UC) luminescence spectra showed that the optimal luminescence was observed at 6at%Yb 3+ /2at%Er 3+ -codoping concentration. A possible UC mechanism for PTO:Yb 3+ /Er 3+ phosphor is discussed by the pump power-dependent UC luminescence spectra. The temperature-dependence (298–548 K) of the fluorescence intensity ratios (FIR) for the two green UC emission bands peaked at 524 and 549 nm was studied under a 980 nm laser excitation and the maximum relative sensitivity was approximately 12.25 × 10 −3 K −1 at 298 K. The thermal quenching activation energy of near-infrared (NIR) luminescence was studied. It can be found that the phosphor has a small thermal quenching possibility and excellent thermal stability. The value of repeatability (R) more than 98% has obtained via four cycles of cooling and heating, which prove that the phosphor has a good cycling stability. These results indicate that PTO:Yb 3+ /Er 3+ phosphor is a promising candidate for optical temperature sensors with high sensitivity and good repeatability.
研究领域:
材料科学
·
光学
·
温度传感
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
J. Zhang,Z.Y. Ma,J.G. Guo,G.M. Cai,L. Ma,X.J. Wang
Color-tunable phosphors based on a single host are superior to traditional mixed primary-color phosphors in fluorescent lamps, due to the better consistency of different color components in service. In this work, a series of Eu 3+ /Tb 3+ doped MgIn 2 P 4 O 14 phosphors were synthesized by a conventional solid state reaction method. The phosphors exhibit strong absorption around 254 nm with negligible absorption in the visible light region. Under the joint action of the co-activation, cross-relaxation, sensitization, and phonon-assistance, color-tunable reddish-orange-yellow-green-blue emission is achieved in MgIn 2 P 4 O 14 : Eu, Tb phosphors by adjusting the doping content, which demonstrates great potential for the application in fluorescent lamps.
研究领域:
材料科学
·
无机化学
·
光电子学
·
发光材料
·
固体物理
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiangling Tian,Zhijun Ma,Jianrong Qiu,Rongfei Wei
Optical fibers have been formed by replacing precursor glass core with precursor ceramic core, in which drawing process, the precursor ceramic melted to fill the space of the core region while the clad glass was softened. Nd 3+ doped LaNbO 4 nanocrystals were precipitated in the core after heat treatment. X-ray diffraction, Raman spectra, high-resolution transmission electron microscopy, electron paramagnetic resonance, optical microscope, and photoluminescence were used to characterize the obtained fiber. No crystallization, cracking, bubble, or undissolved substance is observed in the core region of precursor fiber. Nd 3+ doped LaNbO 4 nanocrystals are precipitated in the core region after thermal treatment. Under the pumping source of 808 nm, three emission bands located at ∼887 nm, ∼1064 nm, and ∼1337 nm are observed, which makes this GC fiber a promising material for the NIR fiber amplifier.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2023
·
IF 3.5
Yichen Ye,Yongbao Xiao,Yao Ji,Weichao Wang
Singly Ho 3+ -doped TeO 2 –Ta 2 O 5 –ZnO (TTZ) glass and optical fiber for 2 μm fiber lasers have been investigated. The glass-forming region of the ternary TTZ glass system is determined to study its glass-forming ability and to select an appropriate glass matrix for doping Ho 3+ ions. Upon the excitation of a 1940 nm laser diode (LD), an intense emission at 2.06 μm with a full width at half maximum (FWHM) of 61 nm is observed from the Ho 3+ -doped TTZ glass. The measured lifetime of the Ho 3+ : 5 I 7 level in TTZ glass shows a gradual decrease from 3.5 to 0.98 ms as the dopant concentrations increase from 0.2 to 2 mol%. A large emission cross-section (σ e MC ∼ 4.56 × 10 −21 cm 2 ) and figure of merit (FOM, ∼ 6.83 × 10 −24 cm 2 ·s) are obtained. The Ho 3+ -doped TTZ glass is further fabricated into an optical fiber with an average transmission loss of 0.12 dB/cm at 1310 nm. The results show that singly Ho 3+ -doped TTZ glass and optical fiber are promising candidates for efficient 2 μm fiber lasers.
研究领域:
光学
·
材料科学
·
光子学
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 43
·16740-16747
·
IF 4.569
Liwei Zeng,Jiyou Zhong,Wenbin Lin,Weiren Zhao
Near-infrared (NIR) spectroscopy (700–1100 nm) based on a phosphor-converted light-emitting diode (pc-LED) has multi-functional applications in bio-imaging, night-vision, and food quality analysis, simulating the development of efficient and ultra-broadband NIR phosphors. Herein, a series of tunable and ultra-broadband NIR phosphor Ga2−2xZnxGexO3:Cr3+ was successfully produced by a [Zn2+–Ge4+] unit co-substituting a [Ga3+–Ga3+] unit in Ga2O3:Cr3+. With the increasing amount of [Zn2+–Ge4+] incorporation, the emission peak can be tuned from 726 to 808 nm, and the maximum FWHM can be extended from 126 to 190 nm. However, the excitation peak position remained nearly unchanged in the blue light region, enabling this material to perfectly match the InGaN blue LED chip. Although the gradually enhanced electron–lattice coupling and low energy barrier for thermal quenching caused by this co-substitution lead to a decrease in the photoluminescence quantum yield (PLQY) and thermal stability, respectively, the absolute values of these two criteria can be well maintained. Finally, to evaluate the practical applications, prototype NIR pc-LEDs were fabricated using these materials combined with 450 nm LED chips. Under the same conditions, the NIR output power and photoelectronic conversion efficiency of these devices are superior to those fabricated using the well-known ScBO3:Cr3+ phosphor. These results demonstrate that this series of materials with tunable and ultra-broadband NIR emissions has great potential for NIR pc-LED applications.
研究领域:
材料科学
·
光学工程
·
生物医学成像
·
半导体器件
·
光电子学
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2024
·Vol. 67
·期 7
·2314-2324
·
IF 10.4
Liu Xue,Li Jiangao,Zhang Fei,Yan Dingyuan,Wang Lei,Wang Dong,Tang Ben Zhong
Light-driven cancer theranostics has shown inexhaustible and vigorous vitality by virtue of its high efficacy, prominent controllability and noninvasiveness. Exploration of an all-round theranostic material simultaneously affording both multimodal diagnosis imaging and synergistic phototherapy would be an appealing yet significantly challenging task. Herein, a novel nanomedicine Ir@PPEG-MeEPO was ingeniously constructed by integrating beforehand 1 O 2 -charged amphiphilic polymer and well-tailored Ir(III) complex IrDPTP, which was featured by second near-infrared (NIR-II) aggregation-induced emission (AIE) tendency, efficient reactive oxygen species (ROS) generation, good photothermal conversion efficiency and high-performance hydrogen gas production. To the best of our knowledge, IrDPTP held the longest emission wavelength among all reported AIE Ir (III) complexes. Moreover, Ir@PPEG-MeEPO was capable of controllably releasing ROS via triggered photothermal effect upon NIR irradiation, making it well-adapted to hypoxic environment of tumor. Those distinctive characteristics of Ir@PPEG-MeEPO endowed it with unprecedented performance on sextuple theranostics comprised of NIR-II fluorescence-photoacoustic-photothermal trimodal imaging and photodynamic-photothermal-hydrogen trimodal therapy, witnessed by the precise tumor diagnosis and complete tumor elimination. The study would open up new perspectives for the exploration of superior nanomedicine for practical cancer theranostics.
研究领域:
肿瘤学
·
生物材料学
·
纳米医学
·
光疗学
✓ 已验证
DOI
高影响因子
Acta Biomaterialia
·
2024
·
IF 9.4
Xing Zhao,Xi Wu,Ranran Shang,Huachao Chen,Ninghua Tan
The Golgi apparatus (GA) is a vital target for anticancer therapy due to its sensitivity against reactive oxygen species (ROS)-induced oxidative stress that could lead to cell death. In this study, we designed a series of aggregation-induced emission (AIE)-based photosensitizers (TPAPyTZ, TPAPyTC, TPAPyTI, and TPAPyTM) carrying different ROS with selective GA-targeted ability. The in vitro study showed that TPAPyTZ and TPAPyTC displayed strong AIE characteristics, robust type-I/II ROS production capabilities, specific GA-targeted, high photostability, and high imaging quality. The cell-uptake of TPAPyTZ was found primarily through an energy-dependent caveolae/raft-mediated endocytosis pathway. Remarkably, TPAPyTZ induced GA-oxidative stress, leading to GA fragmentation, downregulation of GM130 expression, and activation of mitochondria caspase-related apoptosis during photodynamic therapy (PDT). In vivo experiments revealed that TPAPyTZ significantly inhibited tumor proliferation under lower-intensity white light irradiation with minimal side effects. Overall, our work presents a promising strategy for designing AIEgens for fluorescence imaging-guided PDT. Additionally, it enriched the collection of GA-targeted leads for the development of cancer theranostics capable of visualizing dynamic changes in the GA during cancer cell apoptosis, which could potentially enable early diagnosis applications in the future. Statement of significance AIE luminogens (AIEgens) are potent phototheranostic agents that can exhibit strong fluorescence emission and enhance ROS production in the aggregate states. In this study, through the precise design of photosensitizers with four different electron-acceptors, we constructed a series of potent AIEgens (TPAPyTZ, TPAPyTC, TPAPyTM, and TPAPyTI) with strong fluorescence intensity and ROS generation capacity. Among them, TPAPyTZ with an extended π-conjugation displayed the strongest ROS generation ability and anti-tumor activity, resulting in an 88% reduction in tumor weight. Our studies revealed that the enhanced activity of TPAPyTZ may be due to its unique Golgi apparatus (GA)-targeted ability, which causes GA oxidative stress followed by effective cancer cell apoptosis. This unique GA-targeted feature of TPAPyTZ remains rare in the reported AIEgens, which mainly target organelles such as lysosome, mitochondria, and cell membrane. The successful design of a GA-targeted and potent AIEgen could enrich the collection of GA-targeted luminogens, providing a lead theranostic for the further development of fluorescence imaging-guided PDT, and serving as a tool to explore the potential mechanism and discover new GA-specific drug targets.
研究领域:
癌症研究
·
药学
·
生物医学工程
·
材料科学
·
细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Zhaofeng Tian,Yangai Liu,Ci'an Xie,Juyu Yang,Yukun Liu,Chenguang Yang,Ruiyu Mi,Lefu Mei
In the context of the rapid advances in electronic information technology, the advancement of novel high-efficiency narrow-band blue phosphors represents a pivotal step in the advancement of high-quality liquid crystal displays (LCDs), as well as the development of white light-emitting diodes (WLEDs) with a reduced correlated color temperature (CCT). In this study, based on the sensitivity of Eu 2+ emission to local environment, the alkaline earth aluminate material CaAl 12 O 19 with high structural symmetry was selected as the matrix, and the symmetry of crystal structure was improved by replacing Ca 2+ with Sr 2+ , the narrow-band emission of the phosphor is realized. The Sr 0.9 Ca 0.09 Al 12 O 19 : 0.01Eu 2+ (SCAO: Eu 2+ ) phosphor exhibited narrow-band emission with the full width at half maximum (FWHM) of 45.76 nm, and the colour purity of up to 95.46 %. Moreover, the internal quantum efficiency (IQE) of SCAO: Eu 2+ has been demonstrated to reach 81.70 %. In addition, SCAO: Eu 2+ phosphor, (Ba, Sr) 2 SiO 4 : Eu 2+ phosphor, CaAlSiN 3 : Eu 2+ phosphor, and 275 nm UVLED chips were combined to prepare white LED devices exhibiting a low color temperature (3733 K). The three-band LEDs of SCAO: Eu 2+ , β-Sialon: Eu 2+ and K 2 SiF 6 : Mn 4+ exhibited a colour gamut covering 84.75 % of the National Television Standards Committee (NTSC) standard. This indicates that the phosphor possesses the characteristics of a highly effective narrow-band blue-light-emitting substance with considerable potential for utilization in lighting and backlighting displays.
研究领域:
材料科学
·
光学工程
·
电子技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hao Luo,Yuqiong Huang,Hongli Liu,Bao Zhang,Jian Song
Stability issue of blue emitting CsPbX 3 quantum dots (QDs) remains a great challenge for their application in optoelectronic devices. In this work, hydrophobic ionic liquids (ILs) 1-alkyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide (NTf 2 ) were used to obtain blue emission CsPbBr 3 QDs with high color purity featured with a 16 nm full width at half-maximum (FWHM). Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) results elucidated ILs formed effective passivation on QDs through stronger interaction with surface Pb 2+ compared to OA/OAm. This passivation effect led to the enhancement of photoluminescence quantum yields (PLQYs) from 33% for the pristine sample to 51% for QDs modified by ILs. And the stability of the modified QDs was enhanced by keeping the blue emitting even after 32 h UV irradiation. More interestingly, there is an alkyl chain effect existed that QDs with longer alkyl chain ILs exhibit better stability than the ones with shorter alkyl chains. It may relate to the higher hydrophobicity originated from long alkyl chain. Resultantly, Warm white light emitting diode (WLED) based on the IL-contained QDs was fabricated which qualified with a Commission Internationale de L'Eclairage (CIE) color coordinates of (0.33,0.35), Correlated color temperature (CCT) of 5416 K and maximum luminance of 9062.9 cd/m 2 . The demonstrated ILs passivation strategy might be an effective method for preparing blue emitting perovskite QDs with high PLQYs and stability.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）