ACS Nano
·
2025
·
IF 16
Tsz Wing Tang,Ritika Ritika,Mohsen Tamtaji,Hongwei Liu,Yunxia Hu,Zhenjing Liu,Patrick Ryan Galligan,Mengyang Xu,Jinghan Shen,Jun Wang,Jiawen You,Yuyin Li,GuanHua Chen,Igor Aharonovich,Zhengtang Luo
Visible-range single-photon emitters (SPEs), based on hexagonal boron nitride (hBN), with exceptional optical performance have become an outstanding candidate for quantum optical technology. However, the control of the carbon defect structures to obtain uniform and confined band structure remains elusive, restricting their integration into on-chip quantum devices. Here, we demonstrate tuning of the defect structure of hBN to precisely control the emission in SPEs. The defect structure engineering from CB (carbon substituted at the boron site) to C2B–CN (carbon doped into two boron sites and one nitrogen site) carbon defect conversion in hBN is realized by regulating the carbon concentration from 0.0005 at % to 0.082 at % in Cu substrates to adjust the carbon diffusion during the CVD process. Meanwhile, the zero-phonon line exhibits a precise shift from the range of 600–610 nm to 630–640 nm; these shifts of the spectral features are further supported by density functional theory results, reflected in changes in the band structure, vibrational degrees of freedom, and electronic transitions. The SPE emission spectrum serves as a valuable tool for identifying the footprint of a carbon point defect structure change. Our project offers evidence of achieving structured defect engineering for tailored emission properties and showcases potential for the integration of advanced 2D material engineering into on-chip quantum devices.
研究领域:
量子光学
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材料科学
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二维材料
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纳米光子学
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缺陷工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Light-Science & Applications
·
2014
·Vol. 3
·期 8
·e193
·
IF 8.476
Qin Wei-Ping,Liu Zhen-Yu,Sin Chol-Nam,Wu Chang-Feng,Qin Guan-Shi,Chen Zhe,Zheng Ke-Zhi
Cooperative luminescence (CL) occurs in spectral regions in which single ions do not have energy levels. It was first observed more than 40 years ago, and all results reported so far are from a pair of ions. In this work, upconverted CL of three Yb 3+ ions was observed in the ultraviolet (UV) region under near-infrared (NIR) excitation. The UV CL intensity showed a cubic dependence on the NIR pump power, whereas the luminescence lifetime was nearly one-third the luminescence lifetime of single Yb 3+ ions. The triplet CL (TCL) has a clear spectral structure, in which most emission peaks are consistent with the self-convoluted spectra from single Yb 3+ ions. Blue shifts were observed for certain peaks, indicating complex interactions among the excited Yb 3+ ions. The probability of the TCL process versus the average distances among three Yb 3+ ions was derived via the first- and second-order corrections to the wave functions of lanthanide ions, indicating that the formation of Yb 3+ clusters containing closely spaced ions favors the occurrence of the multi-ion interaction processes. Furthermore, the cooperative sensitization of one Gd 3+ ion by four excited Yb 3+ ions (Yb 3+ -tetramer) was demonstrated experimentally, which exhibited a novel upconversion mechanism—cluster sensitization. Our results are intriguing for further exploring quantum transitions that simultaneously involve multiple ions.
研究领域:
光学材料
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稀土发光
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量子光学
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纳米光子学
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固体发光
✓ 已验证
DOI
高影响因子
eLight
·
2023
·Vol. 3
·期 1
·1-8
·
IF 0
Huang Peng,Sun Shipei,Lei Hairui,Zhang Yongyou,Qin Haiyan,Zhong Haizheng
Biexciton emission in quantum dots is an efficient way to generate entangled photon pairs, which are key resources in quantum informatics. Compared with epitaxial grown quantum dots, chemically synthesized colloidal quantum dots show advantages of tunable wavelength and easy integration to realize quantum light sources. However, biexciton efficiency of colloidal quantum dots has been limited by Auger recombination. In this paper, we reported nonlocal interaction enhanced biexciton emission with efficiency up to 80% in large perovskite nanocrystals (> 20 nm). The nonlocal interaction between carriers and excitons leads to the abnormal exponential decrease of Auger recombination with volume in large nanocrystals, which distinguishes with the linear scaling in small counterparts. Such an exponential decrease of Auger recombination results in long lifetime of biexcitons, responsible for the required high biexciton efficiency. The discovery of nonlocal effects in large semiconductor nanocrystals provides new strategies to achieve high efficiency multiple excitons for quantum optics and energy conversation applications.
研究领域:
材料科学
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量子光学
·
光电子学
✓ 已验证
DOI
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yanyan Cheng,Shunfei Qiang,Jiaqi Li,Wenbo Wei,Yanmin Kuang,Wenkai Zhang,Xiaomin Fang,Tao Ding,Lijun Guo,Yujie Chen,Xudong Chen
Carbon dots (CDs) have great potentials in quantum emitters due to their simple synthesis, low cost, high stability, and tunable band gap; however, the low solid-state emission efficiency, as well as nanosecond-scale radiative lifetime, limits their applications requiring bright and fast emission. Here, a bright and ultrafast emission of red-emissive carbon dots (R-CDs) with narrow bandwidth (<30 nm) is achieved at room temperature by coupling with a plasmonic nanopatch antenna (NPA). The NPA manufacturing combines a conventional spin-coating process with a conformal transfer-print thin film technology, providing a widely applicable nanocavity for field enhancement with uniform quality in centimeter scale and accurate control of the position of emitters. The effective NPA–CD coupling generates an increase in the emission intensity of a factor of 76 and a shortened radiative lifetime of 80 ps, which demonstrates an 82-fold faster rate than the emission rate of uncoupled R-CDs. The NPA structure also shows striking enhancement of Raman spectra of carbon dots with an enhancement factor over 105. These results may benefit the low-cost and large-scale fabrication of plasmonic cavity and enable carbon dots to find applications in quantum optics, from low-threshold nanolaser to single-photon source.
研究领域:
光学
·
材料科学
·
量子光学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hongwei Liu,Noah Mendelson,Irfan H. Abidi,Shaobo Li,Zhenjing Liu,Yuting Cai,Kenan Zhang,Jiawen You,Mohsen Tamtaji,Hoilun Wong,Yao Ding,Guojie Chen,Igor Aharonovich,Zhengtang Luo
Single-photon emitters (SPEs) in hexagonal boron nitride (hBN) are promising candidates for quantum light generation. Despite this, techniques to control the formation of hBN SPEs down to the monolayer limit are yet to be demonstrated. Recent experimental and theoretical investigations have suggested that the visible wavelength single-photon emitters in hBN originate from carbon-related defects. Here, we demonstrate a simple strategy for controlling SPE creation during the chemical vapor deposition growth of monolayer hBN via regulating surface carbon concentration. By increasing the surface carbon concentration during hBN growth, we observe increases in carbon doping levels by 2.4-fold for B–C bonds and 1.6-fold for N–C bonds. For the same samples, we observe an increase in the SPE density from 0.13 to 0.30 emitters/μm2. Our simple method enables the reliable creation of hBN SPEs in monolayer samples for the first time, opening the door to advanced two-dimensional (2D) quantum state engineering.
研究领域:
量子光学
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材料科学
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纳米技术
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二维材料
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凝聚态物理
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 4
·803-806
·
IF 1.6
Ma Liang,Hu Yucheng,Zhou Zeyi,Zhu Bo,Zheng Wenjie,Zhang Rui
We reported a low-cost and easy-to-make method to effectively generate quantum dot (QD) states in 2D hBN films for quantum emissions at room temperature by utilizing silica nanospheres, in comparison with the sophisticated nanofabrication method reported in previous studies. The QDs created in 2D hBN films using silica nanospheres exhibit pronounced photon emissions with a good photo-stability in air, a narrow distribution of the emission peaks within the range of 580–620 nm, and a directional emission pattern, behaving as a single electric dipole. Our work develops the method of controllable fabrication of quantum emitters in 2D materials by using nano materials and structures.
研究领域:
量子光学
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纳米光子学
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材料科学
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二维材料
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应变工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）