检索结果-南通市图书馆

On-demand molecular design for efficient blue phosphorescence

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第7期67卷 2124-2126页

作者： Meiqi Dai dongpeng yan Beijing Key Laboratory of Energy Conversion and Storage Materials Key Laboratory of RadiopharmaceuticalsMinistry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China

Blue luminescence(including both fluorescence and phosphorescence)is one of the core elements in solid-state lighting and full-color displays.Up to now,ultralong room temperature phosphorescence(RTP)with a long lifetime over 0.1 s has been continuously reported.Most ultralong phosphorescence emission bands are in the region of 500 to600 nm.However,high-energy blue phosphorescence remains an immense challenge[1].

关键词： blue lifetime bands

One-dimensional molecular co-crystal alloys capable of full-color emission for low-loss optical waveguide and optical logic gate

在线全文

学校读者我要写书评

暂无评论

Aggregate

Aggregate 2024年第1期5卷 299-308页

作者： Zhenhong Qi Yu-Juan Ma dongpeng yan Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryKey Laboratory of Radio-pharmaceuticals Ministry of EducationBeijing Normal UniversityBeijingChina

The luminescence color of molecule-based photoactive materials is the key to the applications in lighting and optical communication.Realizing continuous regulation of emission color in molecular systems is highly desirable but still remains a challenge due to the individual emission band of purely organic molecules.Herein,a novel alloy strategy based on molecular co-crystals is reported.By adjusting the molar ratio of pyrene(Py)and fluorathene(Flu),three types of molecular co-crystal alloys(MCAs)assemblies are prepared involving Py-Flu-OFN-x%,Py-Flu-TFP-x%,Py-Flu-TCNB-x%.Multiple energy level structure and Förster resonance energy transfer(FRET)process endow materials with tunable full-spectra emission color in visible region.Impressively,these MCAs and co-crystals can be successfully applied to low optical loss waveguide and optical logic gate by virtue of all-color luminescence from blue across green to red,together with smooth surface of onedimensional microrods,which show promising applications as continuous light emitters for advance photonics applications.

关键词： full-color emission microrods molecular co-crystal optical waveguide organic alloys

Dynamic multi-color long-afterglow and cold-warm white light through phosphorescence resonance energy transfer in host-guest metal-organic frameworks

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第12期66卷 3532-3538页

作者： Shuya Liu Yuhang Lin dongpeng yan Beijing Key Laboratory of Energy Conversion and Storage Materials Key Laboratory of RadiopharmaceuticalsMinistry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China

Dynamic tuning of single-color and multi-color(including white-light) luminescence has attracted much attention for applications in various fields;however, effective systems are still scarcity to date. Herein, we report the construction of host-guest metal-organic frameworks(MOFs) serves as an effective strategy to achieve the excitation-and time-dependent long afterglow and white light emitting, simultaneously. The guest-induced structural distortion modulates the single-triplet state intersystem crossing, promotes ligand-to-ligand charge transfer(LLCT) in layer-column MOFs, and further boosts multiple exciton generation of triplet states for multi-color ultralong phosphorescence, as indicated by both experiment and density functional theory(DFT) calculation. By further doping of dyes into MOFs, white-light emitting with tunable color temperature can be facilely obtained, which has been further fabricated into white-light light-emitting diode(LED) with color rendering index of 88.4,higher than that of most as-reported pure inorganics and inorganic-organic hybrid systems. Therefore, this work not only describes a host-guest energy transfer route for dynamic tailoring wide range of color-tunable long-afterglow, but also explores the application prospect of new white-light materials with high color rendering and low blue light for promising display and lighting applications.

关键词： phosphorescence ligand-to-ligand charge transfer white-light metal-organic frameworks long-afterglow

Molecular doping for persistent afterglow

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第5期65卷 831-833页

Due to the long emissive lifetime and large Stokes shift,room temperature phosphorescence (RTP) and related materials (including purely organic compounds and organicinorganic hybrids) have attracted recent attention f... 详细信息

关键词： optoelectronic phosphor doping

Colorful ultralong room-temperature phosphorescence in dual-ligand metal-organic framework

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第7期34卷 200-204页

作者： Shuya Liu Yuhang Lin dongpeng yan Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryKey Laboratory of RadiopharmaceuticalsMinistry of EducationBeijing Normal UniversityBeijing100875China

Long afterglow organic-inorganic hybrid materials have attracted much attention in recent years and are widely used in information security, biological imaging and many other fields. Since up-conversion long-persistence materials are promising for bio-optical imaging due to their high penetration depth and elimination of autofluorescence background, it is highly desirable to combine down-conversion and up-conversion pathways to obtain smart materials with excitation-dependent tunable room-temperature phosphorescence properties. In this work, a metal-organic framework(Zn-DCPS-BIMB), consisting of divalent zinc ions, o-bis(imidazol-1-ylmethyl)benzene and 4,4-dicarboxydiphenylsulfone, is designed to stabilize triplet excitons, coordinate the emission of different ligands, and endow materials with tunable emission color and up-conversion properties via heavy atoms effects promoting single-triplet orbital coupling and intersystem crossing.

关键词： Room temperature phosphorescence Information encryption Metal-organic framework Up-conversion luminescence Organic-inorganic hybrids

Brightening room-temperature phosphorescence in solution

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2023年第3期66卷 611-612页

作者： Fei Nie dongpeng yan Beijing Key Laboratory of Energy Conversion and Storage Materials Key Laboratory of RadiopharmaceuticalsMinistry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China

The strategies including noncovalent macrocycle-confined supramolecular assembly and construction of rigid hydrogen-bond network have been verified as effective routes to brighten aqueous-phase room temperature phosphorescence.Molecule-based room-temperature phosphorescence(RTP)has attracted widespread attention in the fields of chemical sensors,optical anti-counterfeiting,information encoding and so on,due to unique characteristics of long excited-state lifetimes,large Stokes shifts and high signal-tonoise ratios[1,2].Currently,to obtain RTP with considerable efficiency and long lifetime,two brilliant strategies have been developed:one is the introduction of heavy atoms,which facilitates the spin-orbital coupling and intersystem crossing(ISC)from singlet to triplet states。

关键词： lifetime excited coupling

MIR1868 negatively regulates rice cold tolerance at both the seedling and booting stages

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2024年第2期12卷 375-383页

作者： yang Shen Xiaoxi Cai yan Wang Wanhong Li dongpeng Li Hao Wu Weifeng Dong Bowei Jia Mingzhe Sun Xiaoli Sun Crop Stress Molecular Biology Laboratory Heilongjiang Bayi Agricultural UniversityDaqing 163319HeilongjiangChina

Low temperature causes rice yield losses of up to 30%–40%,therefore increasing its cold tolerance is a breeding target.Few genes in rice are reported to confer cold tolerance at both the vegetative and reproductive stages.This study revealed a rice-specific 24-nt miRNA,miR1868,whose accumulation was suppressed by cold stress.Knockdown of MIR1868 increased seedling survival,pollen fertility,seed setting,and grain yield under cold stress,whereas its overexpression conferred the opposite phenotype.Knockdown of MIR1868 increased reactive oxygen species(ROS)scavenging and soluble sugar content under cold stress by increasing the expression of peroxidase genes and sugar metabolism genes,and its overexpression produced the opposite effect.Thus,MIR1868 negatively regulated rice cold tolerance via ROS scavenging and sugar accumulation.

关键词： Rice Cold tolerance miRNA ROS scavenging Soluble sugar accumulation

Three-primary-color molecular cocrystals showing white-light luminescence,tunable optical waveguide and ultrahigh polarized emission

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2022年第2期65卷 408-417页

作者： Shuzhen Li yan Hao Shuai Guo Chunjie Ding Yujuan Ma Ruibin Liu dongpeng yan Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001China

Three-primary-color luminescent materials are highly desirable to construct white-light emitting resource,multi-color optical displays,and tunable photonic applications.However,the efficient strategy to establish the three-primary-color systems with unique photofunctionalities is still rather limited,particularly for molecular materials.Herein,we developed a molecular cocrystal route to obtain three-primary-color emissive materials by tuning different donor-acceptor units based on the same chromophore(4,4′-bis(2,5-dimethylstyryl)biphenyl,Bdb).The warm and cold white-light together with multi-color emission in most of visible region can be highly adjusted by rationally tuning different mixture components of three-primary-color cocrystals through an energy transfer mechanism.Furthermore,the blue/green/red emitters endow Bdb molecular cocrystals novel colortunable photonic properties(such as one-dimensional(1D)/2D optical waveguide,polarized fluorescence,up-conversion luminescence,and amplified spontaneous emission),benefitting from their well-defined micro/nanostructures and high crystallinity.Particularly,the high luminescence quantum yield(82.49%)and polarized anisotropy(0.723)outperform most of state-ofthe-art molecular crystalline materials.Therefore,this work supplies an effective way to fabricate new types of three-primarycolor phosphors through luminescent cocrystals,which have promising applications in the fields of full-color displays,whitelight irradiation,low-dimensional optical polarization,and micro/nanophotonics.

关键词： three-primary-color emission molecular crystal white light optical waveguide polarized luminescence

Dynamic Photoresponsive Ultralong Phosphorescence from One-Dimensional Halide Microrods Toward Multilevel Information Storage

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2023年第12期5卷 2866-2876页

作者： Chang Xing Bo Zhou dongpeng yan Wei-Hai Fang Key Laboratory of Theoretical and Computational Photochemistry Ministry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875

Ultralong room temperature phosphorescence(RTP)has drawn much attention in fields such as optical imaging,sensors,information security,and so on.To meet the need for intelligent systems,the development of photoresponsive ultralong RTP materials is highly desirable;however,it remains a challenge due to the lack of rational design strategies that can leverage RTP and photochromism effectively.Herein,we report a new type of one-dimensional(1D)metal–organic halides(MOHs)that simultaneously exhibited dynamic ultralong RTP and photochromic optical waveguide with a large switching ratio,obvious visualization contrast,and robust reversibility.These properties facilitate future applications for multicolor photonic barcodes and optical logic gates.Moreover,benefiting from the color-time-space multidimensional tunable ultralong RTP,this 1D microrod displayed a multimode luminescent signal output,with significantly higher information storage capacity than typical fluorescent systems.Therefore,this work demonstrates a new 1D color-tunable optical waveguide and photoresponsive ultralong RTP based on molecular self-assembly of MOHs and extends frontier photonic applications as multilevel data encryption and information storage at the micro/nanoscale.

关键词： metal-organic halides low-dimensional microcrystals room temperature phosphorescence photochromism optical waveguide