OPTICS LETTERS
·
2018
·Vol. 44
·期 1
·90-93
·
IF 3.589
Jiasheng Li,Yong Tang,Zongtao Li,Xinrui Ding,Longshi Rao,Binhai Yu
Although quantum dots (QDs) have a high quantum yield close to one in a solution, they exhibit low conversion efficiency in a solidification polymer matrix, which hampers the development of QD-based light-emitting diodes (LEDs) with high stability and optical performance. In this study, we proposed a methyl-terminated-polydimethylsiloxane-(PDMS)-based liquid-type packaging structure (LPS) to improve stability and optical performance of QD-based LEDs. Compared with the traditional ethylene-terminated-PDMS-based solid-type packaging structure, the LPS with an optimized kinematic viscosity of 10000 m2/s can provide higher stability and optical performances for QD-based LEDs, including total radiant power and luminous flux. Consequently, the proposed effective and simple strategy has great potential for illumination and display applications.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 21
·3171-3180
·
IF 3.1
Fang Wang,Yiheng Wu,Xieming Xu,Rui Zhang,Qi Luo,Hao Lu,Shuaihua Wang,Shaofan Wu
The current development direction of magneto-optical (MO) isolators involving miniaturisation and application in high-power lasers encounters difficulties in material application because preparing materials with excellent optical quality and a high Verdet constant remains a challenge. Herein, (Tb1−xCex)3Sc2Al3O12 (x = 0.001, 0.0025, 0.005, 0.01, 0.015, 0.02) MO ceramics with different doping concentrations were prepared by vacuum sintering. The phase structure, element distribution, microstructure, relative density, optical properties, surface properties and MO properties of the (Tb1−xCex)3Sc2Al3O12 ceramics were also characterised. Experimental characterisation reveals that the (Tb1−xCex)3Sc2Al3O12 ceramics have a pure Tb3Sc2Al3O12 (TSAG) phase and exhibit an excellent uniform element distribution. In addition, no secondary phase was detected in FESEM images with the increase in Ce concentration. However, a few small-sized residual pores, which remain entrapped in the Ce0.015TSAG and Ce0.02TSAG ceramics, can be observed. Moreover, all the obtained ceramics have good optical quality, and the in-line transmittances of the (Tb1−xCex)3Sc2Al3O12 ceramics at 1064 nm are 81.7%, 83.7%, 80.0%, 84.0%, 68.8% and 77.7%. The Verdet constant of the ceramics is optimised by Ce doping, and the Verdet constants of all the ceramics at the test wavelength are better than those of TSAG ceramic. The Verdet constant of the Ce0.01TSAG ceramic is still superior to that of the TSAG ceramic in the same temperature range. Finally, the extinction ratio values for the CexTSAG (x = 0.001, 0.0025, 0.005, 0.01) ceramics exceeded 40 dB. The Ce0.01TSAG ceramic shows the best optical transmittance, the highest magneto-optical FoM values and the highest Verdet constants. Thus, this ceramic can be used for a high-power laser in the visible and near-infrared regions in the future.
研究领域:
材料科学
·
光学工程
·
无机非金属材料
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 4
·2021-2028
·
IF 2.956
Xiaokai Li,Qiangqiang Zhu,Yangyang Xu,Xiaojian Mao,Minghui Feng,Benxue Jiang,Long Zhang
Highly transparent Y 2 O 3 ceramics using TiO 2 as an additive were synthesized by presintering and hot isostatic pressing (HIP). The effects of TiO 2 contents and sintering conditions on the optical properties of the final transparent ceramics were investigated. A small amount (0.04-0.16 wt%) may decrease the densification temperature by about 200°C. The Y 2 O 3 ceramics doped with 0.16 wt% TiO 2 revealed a transparency of 82% in the wavelength range 1-6 μm. The thermal conductivity of the samples is about 11.8 W/m K at 25°C, which is close to that of the undoped Y 2 O 3 ceramics.
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
CRYSTENGCOMM
·
2019
·Vol. 21
·期 9
·1389-1396
·
IF 3.382
Zhuo Chen,Lvming Dong,Hanchuan Tang,Yan Yu,Lei Ye,Jianfeng Zang
One-dimensional all-inorganic halide perovskites have emerged as one of the most prominent materials in the application of optoelectronic devices due to their remarkable properties such as a low number of defects, morphological anisotropy, mechanical flexibility and fast charge transfer capability. Particularly, cubic (α) phase CsPbI3 has the narrowest band gap of 1.73 eV among all-inorganic lead halide perovskites, exhibiting the greatest potential in solar cell applications. However, the direct synthesis of room temperature stabilized α-CsPbI3 nanowires is challenging and remains unfulfilled because the synthesis reaction usually involves a phase change process, resulting in an undesired orthorhombic (δ) phase with a wider bandgap of 2.82 eV. Here, we report a low-temperature approach to directly synthesize highly stabilized α-CsPbI3 nanowires. Low reaction temperature, capping ligand protection, and extended growth time are employed to successfully grow α-CsPbI3 nanowires. The as-synthesized α-CsPbI3 nanowires are 10–20 μm in length and 5–80 nm in diameter. The X-ray diffraction (XRD), photoluminescence (PL), and UV-vis absorption results verify that these cubic phase nanowires maintain excellent stability at room temperature for 90 days. The CsPbI3 nanowires show a PL peak located at around 685 nm and the UV-vis absorption spectrum further reveals that the band gap is about 1.77 eV. The excellent optical properties of the phase-stable CsPbI3 nanowires offer great potential in the field of optoelectronic devices.
研究领域:
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Zhenyu Jiang,Zhaobei Chen,Zhonglin Luo,Biaobing Wang
A highly efficient flame retardant TFD was synthesized based on 2-thenaldehyde, furfurylamine and DOPO. When 4 % of TFD is incorporated into EP, EP/TFD-4 exhibits 38.9 % of LOI value and UL-94 V-0 rating. In cone calorimeter test, the peak of heat release rate, total heat release, total smoke production are dropped by 20 %, 9 % and 65 % respectively, and the char residue is increased by 67 % as compared with the pure EP. The P/N/S elements in TFD play important roles both in gas phase and condensed phase. The decomposition of 2-thenaldehyde and furfurylamine moieties produces NH 3 , H 2 S, H 2 O, etc., which partly leak and dilute flammable gases, but majorly participate into structural reorganization in the char layer. The degradation of DOPO group releases phosphorus-containing free radicals and phosphate-like compounds. The former quenches the chain combustion reaction, and the later promotes the formation of a stable carbon layer as a barrier effect. Benefited from the good compatability between TFD and EP, and the fine balance between the increased rigidity and the declined cross-linking density, the EP/TFDs exhibit the strikingly similar transmittance to pure EP in the range of 200–800 nm, and the improved mechanical performance in tensile, flexural, and impact tests.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2011
·
IF 2.546
Gang Zhang,Dong-sheng Li,Guang-shun Huang,Xiao-jun Wang,Sheng-ru Long,Jie Yang
Two kinds of monomers containing the thioether units 4,4′-thiodibenzoyl chloride (T-DC) and 4,4′-bis(4-chloroformylphenylthio)benzene (BPB-DC) were synthesized in two steps and were reacted with diamine-containing thioether (–S–) and sulfone units to prepare a polyamide containing high contents of thioether groups. The intrinsic viscosities of the polyamides were 0.81–0.93 dl/g. These polymers had good optical properties , including an optical transmittance of the aromatic polyamide film at 450 nm that was higher than 90%. Additionally, the high quantity of thioether units provided the polymers with high refractive indices of 1.710–1.716 and low birefringences of 0.007–0.009. These polyamides also had excellent thermal properties, with glass transition temperatures ( T g ) of 230–246 °C and initial degradation temperatures ( T d ) of 477–473 °C. Finally, they showed improved solubility in polar aprotic solvents .
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2013
·Vol. 62
·期 9
·1358-1367
·
IF 2.125
Gang Zhang,Dong-ting Bai,Dong-sheng Li,Sheng-ru Long,Xiao-jun Wang,Jie Yang
Two kinds of monomers containing thioether units 4,6-bis(4-chloroformylphenylthio)pyrimidine (BPPM-DC) and 3,6-bis(4-chloroformylphenylthio)pyridazine (BPPD-DC) were synthesized by two steps and were reacted with diamine-containing thioether (−S–) and sulfone units to prepare a kind of polyamide containing heterocycles and high contents of thioether groups. These polyamides had good optical properties, including an optical transmittance of the aromatic polyamide film at 450 nm that was higher than 87%. Additionally, the pyridazine, pyrimidine and the large quantity of thioether units provided the polymers with high refractive indices of 1.722–1.732 and low birefringences of 0.004–0.006. These polyamides were also found to have good thermal properties. They showed improved solubility in polar aprotic solvents and could form tough films with a tensile strength of 79.2–112.3 MPa and a storage modulus of 1.4–2.4 GPa (at 200 °C).© 2013 Society of Chemical Industry
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Zijun Yan,Fangshun Ye,Liyue Xu,Xiao Yang,Shouqiang Lai,Shuli Wang,Yue Lin,Guolong Chen,Yijun Lu,Hao-Chung Kuo,Zhong Chen,Tingzhu Wu
Atomic layer deposition (ALD) plays a pivotal role in raising the long-term stability of perovskite quantum dot (PQD). The deposition temperature of excellent alumina film prepared by ALD is generally higher than 200 °C. In such a temperature environment, the lattice morphology of PQD is seriously damaged. In this work, to effectively protect PQD, the optimum temperature for depositing alumina on the surface of CsPbBr 3 PQD is investigated. The CsPbBr 3 PQD is deposited on a transparent glass substrate . Subsequently, an alumina layer is deposited on the surface of PQD via ALD at a deposition temperature of 40–120 °C. In our experiment, the significant degradation of PQD is observed when the deposition temperature of ALD is set to 80 °C and above. Lowering the deposition temperature can effectively improve the optical performance of PQD. The samples with alumina deposited at 75 °C show excellent stability after undergoing aging tests, and therefore 75 °C is considered the best ALD temperature. Besides, white light-emitting diode (W-LED) is produced by a method that a stack structure consisting of CsPbBr 3 coated via ALD at 75 °C and CdSe QD is excited using blue Micro-LED, and the color gamut of W-LED accounts for the wide area of 94.00% NTSC (1953) and 86.20% Rec.2020 displayed wide color gamut features. The experiment provides practical guidance for selecting the optimal deposition temperature for ALD-packaged PQD-based devices.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Shen Qi,Xiao Jian Mao,Bao Yan Chai,Long Zhang
Transparent aluminum oxynitride (AlON) ceramics have been prepared through a method based on direct reaction sintering of alumina and aluminum nitride powders using MgO and Y2O3 as co-additives. The sintering additives could cause the formation of liquid phase during sintering, which would greatly promote the densification and eliminate pores. The grain size of AlON is about 50-100μm. The influence of different component of Al2O3 and AlN as well as sintering temperature on microstructure and optical properties of AlON have been studied. High transparent AlON ceramics with the in-line transmittance of 80.3% at 2000 nm wavelength have been prepared when the concentration of sintering additives was 0.16wt% Y2O3 and 0.02wt% MgO.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Xuewen Peng,Bin Yang,Danjiang Deng,Zhiwei Cai,Xi Kong,Letao Yang,Jinming Guo
The application of lead-free dielectric ceramics for energy storage has received extensive attention because of their remarkable potential as pulse capacitors in power electronic devices. The current study developed a strategy for improving the energy storage performance of (K 0.5 Na 0.5 )NbO 3 (KNN)-based ceramics by incorporating Bi(Zn 2/3 Nb 1/3 )O 3 to reduce grain size, increase dielectric breakdown strength, and enhance ferroelectric relaxation degree. The resulting 0.87KNN–0.13BZN ceramics exhibited a high energy density (7.4 J/cm 3 ) and moderate energy efficiency (74%) at an ultrahigh electric field (750 kV/cm) as well as excellent optical properties. Therefore, the 0.87KNN–0.13BZN ceramic is a promising candidate for pulse capacitors, providing a feasible approach for the development of new lead-free energy storage materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Y. Lu,S. Khan,C.L. Song,K.K. Wang,G.Z. Yuan,W. Li,G.R. Han,Y. Liu
The column-structured Nb-doped TiO 2 (TNO) films with various Nb concentrations in the range between 0 and 10 at.% have been prepared by a sol–gel method. The phase compositions, element concentrations, microstructures, and optical-electron properties have been characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, electron microscopy , and UV/Vis/Near-IR spectrophotometer. The experimental results show that all of the samples prepared in the present work exhibit column-structured morphology and Nb doping concentration has a non-monotonic effect upon the microstructure. The relatively low conductivity and high transmittance of the samples demonstrate that column-structured microstructures greatly improve the optical and electronic properties of TNO films. The favorable sample with 10 at.% Nb doping concentration exhibits a resistance of about 2.27 Ω cm and transmittance of approximately 68.78% with 85 nm thickness.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
POLYMER INTERNATIONAL
·
2012
·Vol. 61
·期 5
·800-809
·
IF 1.902
Gang Zhang,Jiangjun Hu,Huiwen Yang,Xiaojun Wang,Shengru Long,Jie Yang
4,4′-Bis(4-chloroformylphenylthio)benzene was synthesized in two steps and was reacted with diamine-containing thioether and amide units to prepare a polyamide containing high contents of thioether groups. The intrinsic viscosities of the polyamides were 0.76–0.87 dL g −1 . These polyamides had excellent thermal properties, with glass transition temperatures of 234.8–269 °C and initial degradation temperatures of 461–469.7 °C. They showed improved solubility in polar aprotic solvents and could form moderate strength films with a tensile strength of 75.2–111.6 MPa and storage modulus of 1.0–1.3 GPa (at 220 °C). These polymer films also had good optical properties, including an optical transmittance of the aromatic polyamide film at 450 nm that was higher than 90%. Additionally, the high quantity of thioether units provided the polymers with high refractive indices of 1.700–1.704 and low birefringences of 0.007–0.008. Copyright © 2012 Society of Chemical Industry
研究领域:
材料科学
·
高分子化学
✓ 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）