Pengtao Jing

Changchun Institute of Optics, Fine Mechanics and Physics

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Songnan Qu

University of Macau

Jialong Zhao

Guangxi University

Wenyu Ji

Jilin University

Ding Zhou

Shanxi Medical University

Dezhen Shen

Changchun Institute of Optics, Fine Mechanics and Physics

Di Li

Chinese Academy of Sciences

Ligong Zhang

Beijing Sport University

Xi Yuan

Jilin Normal University

Haibo Li

Institute of Porous Flow and Fluid Mechanics

Andrey L. Rogach

City University of Hong Kong

Cooperative Institutions

Chinese Academy of Sciences

118

Changchun Institute of Optics, Fine Mechanics and Physics

University of Chinese Academy of Sciences

Jilin University

Tsinghua University

Jilin Medical University

Zhengzhou University

State Key Laboratory on Integrated Optoelectronics

Jilin Normal University

Fudan University

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Conquering Aggregation-Induced Solid-State Luminescence Quenching of Carbon Dots through a Carbon Dots-Triggered Silica Gelation Process

Chemistry of Materials (2017)

Ding Zhou Di Li Pengtao Jing Yuechen Zhai Dezhen Shen

Aggregation-induced luminescence quenching of carbon dots (CDots) is the main obstacle for their applications in the solid state. Herein, we report a method to produce strongly luminescent CDots@silica composite gels with highly concentrated emitting centers, where the gelation of tetraethyl orthosilicate is initiated by the surface hydroxyl groups of CDots. The key feature of this approach is to prevent both the collision between high concentrated CDots in gelating solution and their aggregation upon drying. The resultant CDots@silica composite xerogel exhibits both high CDots loading fraction (19.2 wt %) and photoluminescence quantum yields (>40%).

Carbon fibers

10.1021/acs.chemmater.6b05375

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Citations (263)

Improving the efficiency and reducing efficiency roll-off in quantum dot light emitting devices by utilizing plasmonic Au nanoparticles

Journal of Materials Chemistry C (2012)

Wenyu Ji Pengtao Jing Jialong Zhao

Studies on quantum dot light emitting devices (QD-LEDs) show that the lifetime of a QD exciton is modified by localized surface plasmon resonant (LSPR) coupling of Au nanoparticles (NPs). The efficiency roll-off of the device containing Au NPs was reduced by 15%. A significant enhancement of 116% for both luminance and current efficiency for the Au NP containing device was achieved under a high current density of 300 mA cm−2. We evaluate that it takes about 10 ns for each QD to be injected by only one electron–hole from the electrodes, which is about the same length of time as the lifetime of a QD, ∼10 ns. This result indicates that the enhanced radiative rate of QD emitters will decrease the concentration of excitons in the emission layer and reduce the nonradiative recombination caused by QD charging. Present findings demonstrate that the excellent performance of the devices is principally a result of LSPR coupling between Au NPs and QD emitters, which shortens the lifetime of the QD emitters and suppresses the Auger recombination in the QD-LEDs.

Auger effect

Quantum Efficiency

10.1039/c2tc00221c

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Citations (35)

High color purity ZnSe/ZnS core/shell quantum dot based blue light emitting diodes with an inverted device structure

Applied Physics Letters (2013)

Wenyu Ji Pengtao Jing Wei Xu Xi Yuan Yunjun Wang

Deep-blue, high color purity electroluminescence (EL) is demonstrated in an inverted light-emitting device using nontoxic ZnSe/ZnS core/shell quantum dots (QDs) as the emitter. The device exhibits moderate turn-on voltage (4.0 V) and color-saturated deep blue emission with a narrow full width at half maximum of ∼15 nm and emission peak at 441 nm. Their maximum luminance and current efficiency reach 1170 cd/m2 and 0.51 cd/A, respectively. The high performances are achieved through a ZnO nanoparticle based electron-transporting layer due to efficient electron injection into the ZnSe/ZnS QDs. Energy transfer processes between the ZnSe/ZnS QDs and hole-transporting materials are studied by time-resolved photoluminescence spectroscopy to understand the EL mechanism of the devices. These results provide a new guide for the fabrication of efficient deep-blue quantum dot light-emitting diodes and the realization of QD-based lighting sources and full-color panel displays.

10.1063/1.4817086

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Citations (95)

Shell-Dependent Energy Transfer from 1,3,5-Tris(N-phenylbenzimidazol-2,yl) Benzene to CdSe Core/Shell Quantum Dots

The Journal of Physical Chemistry C (2010)

Pengtao Jing Xi Yuan Wenyu Ji Micho Ikezawa Y. Andrew Wang

We studied the energy transfer between CdSe core/shell quantum dots (QDs) and 1,3,5-tris(N-phenylbenzimidazol-2,yl) benzene (TPBI) in inorganic/organic blend films using steady-state and time-resolved photoluminescence (PL) spectroscopy. The shortening in PL lifetime of TPBI molecules and the resulting lengthening in PL lifetime of the QDs demonstrated an efficient energy transfer process from donor to acceptor. The slowest PL decays of CdSe core/shell QDs observed in the blend films with low QD concentration were considered to result from the maximum energy transfer process from the surrounding TPBI molecules of a QD to itself. The PL decay curves of the core/shell QDs with a CdS, ZnS, and CdS/ZnCdS/ZnS shells were simulated to obtain the excited state lifetimes of the surrounding TPBI molecules for understanding the effect of the shells on the energy transfer process. It was surprisingly found that the obtained energy transfer rate to a QD with a thick CdS/ZnCdS/ZnS multishell from the surrounding TPBI molecules with the maximum contribution of the energy transfer was almost the same as that to a QD with a thin ZnS monoshell and smaller than that to a QD with a CdS monoshell. The experimental results indicated the energy level alignment and the structure of shells in CdSe core/shell QDs determined the energy transfer efficiency from TPBI molecules to the core/shell QDs.

Acceptor

Resonant inductive coupling

10.1021/jp107524b

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Citations (20)

Dual-encryption based on facilely synthesized supra-(carbon nanodots) with water-induced enhanced luminescence

RSC Advances (2016)

Xutao Zhang Di Li Ding Zhou Pengtao Jing Wenyu Ji

Dual-encrypted luminescence information has been constructed through water-jet printing and hand writing based on low cost and easily prepared supra-(carbon nanodots).

Nanodot

10.1039/c6ra11076b

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Citations (11)

Near‐Infrared Excitation/Emission and Multiphoton‐Induced Fluorescence of Carbon Dots

Advanced Materials (2018)

Di Li Pengtao Jing Lihuan Sun Yang An Xinyan Shan

Carbon dots (CDs) have significant potential for use in various fields including biomedicine, bioimaging, and optoelectronics. However, inefficient excitation and emission of CDs in both near-infrared (NIR-I and NIR-II) windows remains an issue. Solving this problem would yield significant improvement in the tissue-penetration depth for in vivo bioimaging with CDs. Here, an NIR absorption band and enhanced NIR fluorescence are both realized through the surface engineering of CDs, exploiting electron-acceptor groups, namely molecules or polymers rich in sulfoxide/carbonyl groups. These groups, which are bound to the outer layers and the edges of the CDs, influence the optical bandgap and promote electron transitions under NIR excitation. NIR-imaging information encryption and in vivo NIR fluorescence imaging of the stomach of a living mouse using CDs modified with poly(vinylpyrrolidone) in aqueous solution are demonstrated. In addition, excitation by a 1400 nm femtosecond laser yields simultaneous two-photon-induced NIR emission and three-photon-induced red emission of CDs in dimethyl sulfoxide. This study represents the realization of both NIR-I excitation and emission as well as two-photon- and three-photon-induced fluorescence of CDs excited in an NIR-II window, and provides a rational design approach for construction and clinical applications of CD-based NIR imaging agents.

Two-photon excitation microscopy

Quantum yield

10.1002/adma.201705913

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Citations (460)

Temperature-Dependent Photoluminescence of CdSe-Core CdS/CdZnS/ZnS-Multishell Quantum Dots

The Journal of Physical Chemistry C (2009)

Pengtao Jing Jinju Zheng Micho Ikezawa Xueyan Liu Shaozhe Lv

The photoluminescence (PL) spectra of CdSe-core CdS/CdZnS/ZnS-multishell quantum dots (QDs) were studied to understand the radiative and nonradiative relaxation processes in the temperature range from 80 to 360 K. The mechanism of temperature-dependent nonradiative relaxation processes in the CdSe QDs with changing the shell structures was found to evolve from thermal activation of carrier trapping by surface defects/traps in CdSe core QDs to the multiple longitudinal-optical (LO) phonon-assisted thermal escape of carriers in the core/shell QDs. An increase in PL intensity with increasing temperature was clearly observed in the core/shell QDs with a thick CdS monoshell and a CdS/ZnCdS/ZnS multishell. The PL enhancement was considered to come from delocalization of charge carriers localized at the CdSe/CdS interface with the potential depth of ∼30 meV. The experimental results indicated that the improvement of PL quantum efficiency in CdSe-core CdS/CdZnS/ZnS-multishell QDs could be understood in terms of the reduction of nonradiative recombination centers at the interfaces and on the surface of the multishell, as well as the confinement of electrons and holes into the QDs by an outer ZnS shell.

Charge carrier

10.1021/jp902080p

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Citations (245)

Thermally Activated Upconversion Near‐Infrared Photoluminescence from Carbon Dots Synthesized via Microwave Assisted Exfoliation

Small (2019)

Di Li Chao Liang Elena V. Ushakova Minghong Sun Xiaodan Huang

Abstract Upconversion near‐infrared (NIR) fluorescent carbon dots (CDs) are important for imaging applications. Herein, thermally activated upconversion photoluminescence (UCPL) in the NIR region, with an emission peak at 784 nm, which appears under 808 nm continuous‐wave laser excitation, are realized in the NIR absorbing/emissive CDs (NIR‐CDs). The NIR‐CDs are synthesized by microwave‐assisted exfoliation of red emissive CDs in dimethylformamide, and feature single or few‐layered graphene‐like cores. This structure provides an enhanced contact area of the graphene‐like plates in the core with the electron‐acceptor carbonyl groups in dimethylformamide, which contributes to the main NIR absorption band peaked at 724 nm and a tail band in 800–850 nm. Temperature‐dependent photoluminescence spectra and transient absorption spectra confirm that the UCPL of NIR‐CDs is due to the thermally activated electron transitions in the excited state, rather than the multiphoton absorption process. Temperature dependent upconversion NIR luminescence imaging is demonstrated for NIR‐CDs embedded in a polyvinyl pyrrolidone film, and the NIR upconversion luminescence imaging in vivo using NIR‐CDs in a mouse model is accomplished.

Photon Upconversion

Exfoliation joint

10.1002/smll.201905050

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Citations (98)

Combining Ruthenium(II) Complexes with Metal–Organic Frameworks to Realize Effective Two-Photon Absorption for Singlet Oxygen Generation

ACS Applied Materials & Interfaces (2016)

Wenxiang Zhang Bin Li Heping Ma Liming Zhang Yunlong Guan

Singlet oxygen ((1)O2), as a reactive oxygen species, has garnered serious attention in physical, chemical, and biological studies. In this paper, we designed and synthesized a new type of singlet-oxygen generation system by exchanging cationic ruthenium complexes (RCs) into anionic bio-MOF-1. The resulting bio-MOF-1&RCs can be used as effective photocatalysts for generation of singlet oxygen under both single-photon and two-photon excitation. Especially, the excellent two-photon absorption (TPA) behavior of bio-MOF-1&RCs aroused our interest greatly because their two-photon absorption band lies in the optical window of biological tissue. Here, we measured the ability of bio-MOF-1&RCs to generate (1)O2 by irradiation under both 490 and 800 nm wavelength light in DMF. 1,3-Diphenylisobenzofuran (DPBF) and 2',7'-dichlorofluorescein (DCFH) were used as typical (1)O2 traps to detect and evaluate the efficiency of generation of (1)O2 under single-photon and two-photon excitation, respectively. Results indicated that bio-MOF-1&[Ru(phen)3](2+) was able to effectively generate (1)O2 under both conditions. Our work creates a novel synergistic TPA system with the excellent photophysical properties of RCs and the unique microporous structure benefit of MOFs, which may open a new avenue for creation of a cancer treatment system with both photodynamic therapy and chemotherapy.

10.1021/acsami.6b05817

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Citations (90)

Full‐Color Inorganic Carbon Dot Phosphors for White‐Light‐Emitting Diodes

Advanced Optical Materials (2017)

Zhen Tian Xutao Zhang Di Li Ding Zhou Pengtao Jing

Light‐emitting carbon dots (CDots) are widely investigated due to their distinct merits. However, it is still a challenge to modulate their bandgap emissions and conquer their aggregation‐induced luminescence quenching to achieve full‐color highly emissive CDot‐based phosphors. Herein, this study proposes an approach toward realization of full‐color emissive CDots from two common precursors, citric acid and urea, through employing three different solvents (water, glycerol, and dimethylformamide) and their combinations in a solvothermal synthesis. Employing sodium silicate solution, this study further demonstrates the microwave‐assisted method allowing to incorporate CDots into a silica network, which effectively prevents aggregation of CDots and results in strongly luminescent full‐color inorganic CDot phosphors with photoluminescence quantum yields of 30–40%. Through deposition of the red‐ and green‐emitting CDot phosphors on blue‐emitting InGaN chips, white‐light‐emitting diodes are fabricated with Commission Internationale de L'Eclairage of (0.34, 0.31) and the color rendering index of 82.4, indicating their promising application for solid‐state lighting.

Color rendering index

Color temperature

10.1002/adom.201700416

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Citations (418)