ACS Nano
·
2023
·
IF 17.1
Wenjia Zhou,Rui Xu,Haobo Wu,Xianyuan Jiang,Hao Wang,F. Pelayo García de Arquer,Zhijun Ning
Emerging applications such as augmented reality, self-driving vehicles, and quantum information technology require optoelectronic devices capable of sensing a low number of photons with high sensitivity (including gain) and high speed and that could operate in the infrared at telecom windows beyond silicon’s bandgap. State-of-the-art semiconductors achieve some of these functions through costly and not easily scalable doping and epitaxial growing methods. Colloidal quantum dots (QDs), on the other hand, could be easily tuned and are compatible with consumer electronics manufacturing. However, the development of a QD infrared photodetector with high gain and high response speed remains a challenge. Herein, we present a QD monolithic multijunction cascade photodetector that advances in the speed-sensitivity-gain space through precise control over doping and bandgap. We achieved this by implementing a QD stack in which each layer is tailored via bandgap tuning and electrostatic surface manipulation. The resulting junctions sustain enhanced local electric fields, which, upon illumination, facilitate charge tunneling, recirculation, and gain, but retain low dark currents in the absence of light. Using this platform, we demonstrate an infrared photodetector sensitive up to 1500 nm, with a specific detectivity of ∼3.7 × 1012 Jones, a 3 dB bandwidth of 300 kHz (0.05 cm2 device), and a gain of ∼70× at 1300 nm, leading to an overall gain-bandwidth product over 20 MHz, in comparison with 3 kHz of standard photodiode devices of similar areas.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yufeng Zhou,Jing Ding,Ze Wang,Yao Tong,Xiaojuan Liang,Juan Du,Wei Xia,Zhengzheng Liu,Weidong Xiang
In recent years, perovskite nanocrystals (NCs) have been considered novel and potentially valuable optical gain materials that can generate relatively low thresholds and stable stimulated emissions in various external environments. Here, for the first time, an ethylene vinyl acetate copolymer (EVA) film-protected metal halide perovskite (Cs 4 PbBr 6 ) solid powder was successfully synthesized, and its photoluminescence quantum yield (PLQY) value was as high as 61%. In addition, because the Cs 4 PbBr 6 @EVA composite film has excellent optical gain performance, this work explored the optical gain of the Cs 4 PbBr 6 @EVA composite film under 800 nm femtosecond (fs) laser excitation. The experimental results show that the Cs 4 PbBr 6 @EVA composite film has a low threshold (0.89 mJ/cm 2 ) and stable stimulated emission and generates amplified spontaneous emissions (ASEs) at 544 nm. In addition, the application of Cs 4 PbBr 6 @EVA composite film in the field of white light-emitting diodes (WLEDs) has also been studied. The color gamut of this Cs 4 PbBr 6 @EVA composite film is as high as 124.7% of the National Television Standards Committee (NTSC) 1953 standard color gamut and covers 92.8% of the Rec. 2020 standard color gamut. This work proposes a simple method to solve the problem of the poor stability of perovskite solid powder, and the prepared Cs 4 PbBr 6 @EVA composite film shows significant promise in WLED and laser applications.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yan Sun,Aowen Chen,Jingdao Yang,Kun Zhang,Sikai Wang,Xuerong Xu,Luyue Niu,Yue Jing,Ci Wang,Jing Ren,Jianzhong Zhang
Expanding gain bandwidth into the L-band for erbium-doped fiber amplifiers (EDFAs) is a crucial strategy to overcome limitations in prevalent C-band focused commercial silica-based EDFAs, significantly boosting optical network transmission capacity. Herein, we synthesized Er 3+ -doped broadband near-infrared emission tellurite glasses utilizing the melt quenching process, systematically exploring the impact of ZnCl 2 on the glass structure and optical properties. The 82TeO 2 –3Nb 2 O 5 –15ZnCl 2 –3Er 2 O 3 (TNZ15) glass emerged as a standout candidate for broadband amplifiers around wavelength at 1.55 μm. With escalating ZnCl 2 concentration, a discernible red shift in the emission peak wave lines was observed, accompanied by an expansion of the full width at half maximum (FWHM) from 98 nm to 106 nm. Noteworthy characteristics of all samples included exceptional thermal stability and elevated near-infrared (NIR) transmittance. Application of the Judd-Ofelt (J-O) theory facilitated the calculation of J-O parameter intensity, providing deeper insights into the optical behavior of the materials. Finally, the evaluation of TNZ15 planar optical waveguides, employing the vertical top pumping mode of two 980 nm LEDs, encompassed both the C-band (1530–1565 nm) and the L-band (1565–1625 nm). The results underscore the potential of TNZ15 glass as a promising gain material for broadband optical amplifiers and lasers, offering valuable insights into the development of next-generation optical amplification technologies.
研究领域:
光学材料
·
光通信
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Chang Jiang,Longxiang Jiang,Qianbiao Du,Linzhao Ma,Zhicong Chen,Hao Li
LiMg 6 GaO 8 ceramics were synthesized via solid-state reaction method. Systematic investigation reveals that samples sintered at 1260 °C demonstrate exceptional microwave dielectric properties (MDPs): ε r = 10.82, Q×f = 123,083 GHz, and τ f = −22.76 ppm/°C. P-V-L theory analysis indicates that Mg-O bonds dominate lattice energy (72.6 %), while Ga-O bonds contribute most to ionicity (35.7 %). Based on these excellent MDPs, the designed array dielectric resonator antenna (DRA) achieves significant gain and radiation efficiency. The unit DRA delivers performance with 5.78 dBi gain and more than 90 % radiation efficiency. Its breakthrough two-element array DRA boosts gain to 6.39 dBi, providing an improvement over conventional designs while maintaining high radiation efficiency.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 54
·32976-32983
·
IF 3.119
Xinyu Zhao,Lixiang Huang,Yukun Wang,Xinglin Zhu,Lei Li,Guoxin Li,Wenhong Sun
Efficient CH3NH3PbI3 photodetectors (PDs) with an extremely high gain of the maximum external quantum efficiency (EQE) of 140 000% within the ultraviolet region to the near infrared region (NIR) and an extremely high responsivity (R) under a low bias of −5 V were successfully fabricated. The fabricated devices manifested outstanding environmental stability with only 10% degradation of EQE after being exposed to air for 24 h. These obtained results indicate the promising potential of perovskite PDs for visible light communication applications.
研究领域:
材料科学
·
光电工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 14
·2300248
·
IF 9
Huayu Wei,Chenlin Wang,Xiaoxiao Li,Heyan Meng,Bingyi Tong,Luxi Li,Xuepeng Zhan,Bing Jin,Baoqing Sun,Yanmin Zong,Xian Zhao,Yuan Gao
Cadmium chalcogenide colloidal quantum wells (CQWs) are a unique class of optical gain materials that can be precisely engineered in terms of thickness and composition at the atomic level using colloidal atomic layer deposition (c-ALD). However, the atomic layer deposition is typically performed at room temperature, resulting in low emission efficiency and the need for additional thermal annealing. In this study, ultraviolet (UV) illumination is used to treat the CQWs prepared using c-ALD and a significant improvement in their photoluminescence is observed, with an irreversible 79-fold increase. Furthermore, the lasing threshold is reduced to two-thirds of the untreated samples, enabling whispering gallery mode lasing from the CQW in solution. This research demonstrates an efficient and convenient method for boosting the emission from the CQWs and highlights the advantages of CQWs as optical gain media that can be engineered with atomic precision.
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
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 52
·2411736
·
IF 18.5
Laijiang Wei,Zhiming Wu,Yuchao Wei,Chunyu Li,Ziyi Fu,Jiayue Han,Xiutao Yang,Jinling Xie,Zexing Tian,Hongxi Zhou,Jun Wang
2D materials are extensively employed in the fabrication of high-performance photodetectors owing to their exceptional physical properties. However, most 2D material photodetectors fail to sustain high gain under intense illumination due to the limited intrinsic trap states. Here, an n-n type Bi 2 O 2 Se/SnSe 2 van der Waals tunneling heterojunction photodetector with a detection range from visible to near-infrared (VIS-NIR) is presented. Under reverse bias, the heterojunction induces a significant electron barrier and hole potential well, ensuring low leakage current and ample hole defect states. Therefore, the photodetector demonstrated a responsivity of 1636.3 AW −1 and a detectivity of 1.39 × 10 14 Jones under 660 nm illumination, maintaining a tunable linear dynamic range (LDR) of ≈74.7 dB. This performance is attributed to the hole potential well-suppressing the recombination of photogenerated carriers, thereby enhancing the device's gain. Furthermore, the tunneling of photogenerated electrons within the heterojunction's space charge region under bias enables rapid response (75.1 and 15.6 µs). In summary, the study introduces a novel strategy to overcome the limited detection capabilities of 2D devices under intense illumination, characterized by outstanding linearity for rapid detection and high-resolution imaging.
研究领域:
材料科学
·
光电工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 102
·83795-83800
·
IF 3.84
Dezhong Zhang,Fuyi Jing,Fengli Gao,Liang Shen,Dongming Sun,Jingran Zhou,Yu Chen,Shengping Ruan
The performance of a Schottky metal–semiconductor–metal (MSM) ultraviolet (UV) photodetector is limited by the insufficient gain and the uncontrollable noise current. A remarkable detectivity UV detector is demonstrated based on graphene oxide (GO) modified TiO2 with high gain and low noise. The GO layer completely prevents the flow of electrons forming a hole-only device thus decreasing the dark current and noise current. Furthermore, gain of the holes is promoted under UV illumination. Moreover, the GO layer efficiently extracts the holes therefore reducing the fall time. Under a bias of 6 V, the responsivity value reaches 826.8 A W−1 and the noise current is only 1.8 pA, thereby, our device provides a detectivity of 2.82 × 1013 cm Hz1/2 W−1 at 280 nm. The results offer an effective approach to enhance the performance of a UV detector.
研究领域:
材料科学
·
光电探测
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 4
·3224-3230
·
IF 3.84
Yang Zheng,Changming Chen,Yunlong Gu,Jihou Wang,Shouzhuo Yang,Xu Fei,Xibin Wang,Yunji Yi,Xiaoqiang Sun,Fei Wang,Daming Zhang
In this study, a metal-cladding directly defined active waveguide technique is proposed. Optical waveguide amplifiers and thermo-optic (TO) waveguide switches based on erbium-containing polymer are designed and fabricated using this technique. The Er organic complexes containing polymeric reactivity groups are synthesized and investigated by free radical copolymerization. Optical characteristics and thermal stabilities of the active polymer are analyzed. Relative optical gain of the amplifier at 1530 nm is obtained as 3.6 dB. The rise and fall response time of the TO switch applied by 300 Hz square-wave voltage is measured as 511.7 μs and 341.5 μs, respectively. The power-time product is 12.5 mW ms and the extinction ratio is about 20 dB. The technique is very suitable for realizing large-scale optoelectronic integrated circuits.
研究领域:
光学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 23
·期 4
·1039-1042
·
IF 1.174
Luo Jianxin,Zhang Chunyan,Yang Fulin,Hu Hanxiang
A novel erbium-containing polymer precursor (Er(TTA) 3 (HCQ), TTA = 2-thenoyltrifluoroacetone, HCQ = 5-(2-methacryloylethyloxymethyl)-8-quinolinol), was synthesized, and characterized by elemental analysis, FT-IR, UV–vis absorption and photoluminescent spectra. The complex involves two different organic ligands: 5-(2-methacryloylethyloxymethyl)-8-quinolinol, which is derived from 8-hydroxyquinoline to serve not only as a ligand but also as a functional group for polymer precursor and 2-thenoyltrifluoroacetone, which is a critical component for allowing the complex to exhibit desirable photophysical properties. When excited at the absorption band of the ligand ( λ
ex = 410 nm), the complex shows a characteristic near-infrared emission of the Er ion. The full-width at half-maximum of this emission band is 97 nm, which enables a wide gain bandwidth for optical amplification.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2013
·
IF 1.211
Xiujie He,Jinliang Song,Li Xu,Jie Tan,Huihao Xia,Baoliang Zhang,Zhoutong He,Lina Gao,Xingtai Zhou,Mingwen Zhao,Zhiyong Zhu,Shuo Bai
Infiltration studies were performed on uncoated nuclear graphite and isotropic pyrolytic carbon (PyC) coated graphite in molten FLiNaK salt at 650 °C under argon atmosphere at 1, 3 and 5 atm. Uncoated graphite shows weight gain more obviously than that of PyC coated graphite. Nuclear graphite with PyC coating exhibits excellent infiltration resistance in molten salt due to the small open porosity as conformed from scanning electron microscopy and mercury injection experiments.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Guowu Tang,Qi Qian,Xin Wen,Guanxiang Zhou,Xiaodong Chen,Min Sun,Dongdan Chen,Zhongmin Yang
For the first time to the best of our knowledge phosphate glass-clad optical fibers comprising tellurium (Te) semiconductor core have been fabricated using a molten core approach. The cores were found to be highly crystalline and phase-pure as evidenced by X-ray diffraction (XRD) and corroborated by Micro-Raman spectrum. Elemental analysis across the core/clad interface suggests that there is some diffusion of oxygen and phosphorus into the core region and, conversely, diffusion of Te into the cladding region. Unfortunately, the propagation loss of the Te core fibers was too high to measure due to the significant scattering from the grain boundaries, oxygen and phosphor precipitates. However, the larger Raman gain, infrared and terahertz transparency of tellurium over silicon and germanium should make these fibers of significant value for fiber-based mid- to long-wave infrared, terahertz waveguides and Raman-shifted infrared light sources.
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
危险品化学品经营许可证（带存储）