Dongling Geng

Civil Aviation University of China

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Mengmeng Shang

Shandong University

Jun Lin

Changchun Institute of Applied Chemistry

Yang Zhang

Beijing Normal University

Hongzhou Lian

Chinese Academy of Sciences

Ziyong Cheng

Changchun Institute of Applied Chemistry

Xiaojing Li

Hebei University of Engineering

Xiaojiao Kang

Dongguan University of Technology

Chong Peng

Dalian University

Gabriel Lozano

Consejo Superior de Investigaciones Científicas

Dongmei Yang

University of Science and Technology of China

Cooperative Institutions

Chinese Academy of Sciences

University of Chinese Academy of Sciences

International Centre for Materials Physics

Nanjing University of Science and Technology

Tianjin University

University of Science and Technology of China

Changchun Institute of Applied Chemistry

Civil Aviation University of China

Jilin University

Ministry of Industry and Information Technology

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Indandione‐Terminated Quinoidal Compounds for Low‐Bandgap Small Molecules with Strong Near‐Infrared Absorption: Effect of Conjugation Length on the Properties

Chemistry - A European Journal (2021)

Lei Sun Tian Du Cheng Wang Dongling Geng Lin Li

Low-bandgap organic semiconductors have attracted much attention for their multiple applications in optoelectronics. However, the realization of narrow bandgap is challenging particularly for small molecules. Herein, we have synthesized four quinoidal compounds, i. e., QSN3, QSN4, QSN5 and QSN6, with electron rich S,N-heteroacene as the quinoidal core and indandione as the end-groups. The optical bandgap of the quinoidal compounds is systematically decreased with the extension of quinoidal skeleton, while maintaining stable closed-shell ground state. QSN6 absorbs an intense absorption in the first and second near-infrared region in the solid state, and has extremely low optical bandgap of 0.74 eV. Cyclic voltammetry analyses reveal that the lowest unoccupied molecular orbital (LUMO) energy levels of the four quinoidal compounds all lie below -4.1 eV, resulting in good electron-transporting characteristics in organic thin-film transistors. These results demonstrated that the combination of π-extended quinoidal core and end-groups in quinoidal compounds is an effective strategy for the synthesis of low-bandgap small molecules with good stability.

HOMO/LUMO

10.1002/chem.202103227

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Citations (9)

Photonic Tuning of the Emission Color of Nanophosphor Films Processed at High Temperature

Advanced Optical Materials (2017)

Dongling Geng Gabriel Lozano Mauricio E. Calvo Nuria O. Núñez Ana Isabel Becerro

Photonics offers new possibilities to tailor the photoluminescence process in phosphor‐converted light emitting diodes. Herein, it is demonstrated that the emission color of thin layers of rare‐earth doped nanocrystals can be strongly modulated in tunable spectral ranges using optical resonators specifically designed to this end. GdVO 4 :Dy 3+ nanoparticles of controlled size and shape are synthesized using a solvothermal method with which highly transparent nanophosphor thin films are prepared. This paper designs and fabricates optical multilayers, which are transparent in the UV and resonant at the frequencies where the Dy 3+ ions emit, to prove that the color coordinates of this emitter can be tuned from green to blue or yellow with unprecedented precision. Key to the achievement herein reported is the careful analysis of the structural and optical properties of thin nanophosphor layers with the processing temperature in order to achieve efficient photoluminescence while preserving the transparency of the film. The results open a new path for fundamental and applied research in solid‐state lighting in which photonic nanostructures allow controlling the emission properties of state‐of‐the‐art materials without altering their structure or chemical composition.

10.1002/adom.201700099

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Single-Composition Trichromatic White-Emitting Ca₄Y₆(SiO₄)₆O: Ce³⁺/Mn²⁺/Tb³⁺Phosphor: Luminescence and Energy Transfer

ACS Applied Materials & Interfaces (2011)

Guogang Li Yang Zhang Dongling Geng Mengmeng Shang Chong Peng

A series of Ca(4)Y(6)(SiO(4))(6)O (CYS): Ce(3+)/Mn(2+)/Tb(3+) oxyapatite phosphors were prepared via high-temperature solid-state reaction. Under UV excitation, there exist dual energy transfers (ET), i.e., Ce(3+)→Mn(2+) and Ce(3+)→Tb(3+) in the CYS: Ce(3+), Mn(2+), Tb(3+) system and their emitting colors can be adjusted from blue to orange-red via ET of Ce(3+)→Mn(2+) and from blue to green via ET of Ce(3+)→Tb(3+), respectively. Moreover, a wide-range-tunable white light emission with high quantum yields (13%-30%) were obtained by precisely controlling the contents of Ce(3+), Mn(2+) and Tb(3+) ions. On the other hand, the CL properties of CYS: Ce(3+), Mn(2+), Tb(3+) phosphors have been investigated in detail. The studied results indicate that the as-prepared CYS: Ce(3+), Mn(2+), Tb(3+) phosphors have good CL intensity and CIE color coordinate stability with a color-tunable emission crossing the whole white light region under low-voltage electron beam excitation. In general, the white light with varied hues has been obtained in Ce(3+), Mn(2+), and Tb(3+)-triactivated CYS phosphors by utilizing the principle of energy transfer and properly designed activator contents under UV (284, 358 nm) and low-voltage (1-5 kV) electron beam excitation, which make them as a potential single-composition trichromatic white-emitting phosphor.

Chromaticity

10.1021/am201335d

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Color Tuning Luminescence of Ce³⁺/Mn²⁺/Tb³⁺-Triactivated Mg₂Y₈(SiO₄)₆O₂ via Energy Transfer: Potential Single-Phase White-Light-Emitting Phosphors

The Journal of Physical Chemistry C (2011)

Guogang Li Dongling Geng Mengmeng Shang Yang Zhang Chong Peng

Ce3+, Mn2+, and Tb3+-activated Mg2Y8(SiO4)6O2 (MYS) oxyapatite phosphors have been prepared via solid state reaction process. The Ce3+ emission at different lattice sites in MYS host has been identified and discussed. Under UV excitation, there exist dual energy transfers (ET), that is, Ce3+ → Mn2+ and Ce3+ → Tb3+ in the MYS: Ce3+/Mn2+/Tb3+ system. The energy transfer from Ce3+ to Mn2+ in MYS: Ce3+/Mn2+ phosphors has been demonstrated to be a resonant type via a dipole–quadrupole mechanism, and the critical distance (RC) calculated by quenching concentration method and spectral overlap method are 10.5 and 9.7 Å, respectively. The emitting colors of MYS: Ce3+/Mn2+/Tb3+ samples can be adjusted from blue to orange-red via ET of Ce3+ → Mn2+ and from blue to green via ET of Ce3+ → Tb3+, respectively. More importantly, a wide-range-tunable white light emission with high quantum yields (37–47%) were obtained by precise control of the contents of Ce3+, Mn2+, and Tb3+ ions. On the other hand, the CL properties of MYS: Ce3+/Mn2+/Tb3+ phosphors have been investigated in detail. The results indicate that the as-prepared MYS: Ce3+/Mn2+/Tb3+ phosphors have good CL intensity and CIE coordinate stability with a color-tunable emission crossing the whole visible light region under low-voltage electron beam excitation. In conclusion, the white light with varied hues has been obtained in Ce3+, Mn2+ and Tb3+-activated MYS phosphors by utilizing the principle of energy transfer and properly designed activator contents as well as the select of excitation wavelength under UV and low-voltage electron beam excitation.

10.1021/jp204824d

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Citations (219)

Structure and magnetic properties of surface alloyed Fe nanocapsules prepared by arc discharge

Physica B Condensed Matter (2005)

Ping-Zhan Si Chul-Jin Choi E. Brück Dongling Geng Z.D. Zhang

Nanocapsules

Electric arc

10.1016/j.physb.2005.08.023

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Facet-induced coordination competition for highly ordered CsPbBr3 nanoplatelets with strong polarized emission

Nano Research (2021)

Dandan Yang Xiaoming Li Yuelei Li Bo Cai Lin Su

Facet (psychology)

10.1007/s12274-021-3509-6

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Citations (27)

Color Tuning: Photonic Tuning of the Emission Color of Nanophosphor Films Processed at High Temperature (Advanced Optical Materials 13/2017)

Advanced Optical Materials (2017)

Dongling Geng Gabriel Lozano Mauricio E. Calvo Nuria O. Núñez Ana Isabel Becerro

In article number 1700099, Gabriel Lozano, Hernán Miguez, and co-workers explore photonic tuning of the emission color of nanophotonics films. The emission of these GdVO4:Dy3+ nanocrystals can be strongly modulated from blue to yellow, using photonic multilayers, in which a transparent and bright nanophosphor film is integrated as an optical dopant. Photonics offers new opportunities to tailor the emission of nanophosphor materials, which can provide benefits to next generation light-emitting devices.

Nanophotonics

Optical materials

10.1002/adom.201770064

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Citations (1)

Synthesis of 2-substituted-Pyrimidine-based porous aromatic frameworks via oxygen involved biginelli multicomponent polymerization: toward high performance Li–S batteries

Materials Today Chemistry (2022)

Hai‐Feng Ji Guoying Yan Honghai Wang Yi Feng Xiaojie Zhang

10.1016/j.mtchem.2022.100875

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Color tuning via energy transfer in Sr3In(PO4)3:Ce3+/Tb3+/Mn2+ phosphors

Journal of Materials Chemistry (2012)

Dongling Geng Guogang Li Mengmeng Shang Dongmei Yang Yang Zhang

Sr3In(PO4)3 (SIP):Ce3+/Tb3+/Mn2+ phosphors have been prepared via a solid state reaction process. Under UV excitation, there are three energy transfer (ET) pairs in the SIP host, i.e., Ce3+ → Tb3+, Ce3+ → Mn2+, and Tb3+ → Mn2+. Both of the ETs from Ce3+ to Tb3+ and from Ce3+ to Mn2+ in the SIP host have been demonstrated to be resonant type via a dipole–quadrupole mechanism, and the critical distance (RC) calculated by the quenching concentration method and spectral overlap method, respectively, were investigated. By the ET of Ce3+ → Tb3+, Ce3+ → Mn2+, and Tb3+ → Mn2+ the emitting colors of the studied samples could be adjusted from blue to green, from blue to orange-red, and from green to green-yellow, respectively. More importantly, under low-voltage electron beam excitation, the CL spectra of the SIP:Ce3+, Mn2+ samples cover the whole visible light region, resulting in a white light emission. Additionally, the CL properties of SIP:Ce3+/Tb3+/Mn2+ phosphors have been investigated in detail. The results reveal that the as-prepared phosphors have good CL intensity and CIE coordinate stability under electron beam bombardment. Compared with the commercial green phosphor ZnO:Zn, SIP:7% Ce3+, the 10% Tb3+ sample has a higher CL brightness. In conclusion, tunable light with high quantum yield (68%) has been obtained in SIP:Ce3+/Tb3+/Mn2+ phosphors by utilizing the principle of energy transfer and properly selecting the activator contents under UV and electron beam excitation.

Quantum yield

10.1039/c2jm32392c

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Citations (134)

Electromagnetic-wave-absorption properties of wire-like structures self-assembled by FeCo nanocapsules (vol 41, 175001, 2008)

X. G. Liu Dongling Geng Hui Meng B. Li Qiuwen Zhang

[liu, x. g.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;liu, xg (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china.;liuxianguohugh@gmail.com

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