scholarly journals Synthesis and Luminescent Properties of Carbon Nanodots Dispersed in Nanostructured Silicas

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3267
Author(s):  
Andrii Vasin ◽  
Dmytro Kysil ◽  
Andriy Rusavsky ◽  
Oksana Isaieva ◽  
Alexander Zaderko ◽  
...  
Keyword(s):  
Carbon Nanoparticles ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Carbon Nanodots ◽  
Ultraviolet Emission ◽  
Organic Precursor ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
New Class ◽  
Nanostructured Silica

Luminescent carbon nanoparticles are a relatively new class of luminescent materials that have attracted the increasing interest of chemists, physicists, biologists and engineers. The present review has a particular focus on the synthesis and luminescent properties of carbon nanoparticles dispersed inside nanostructured silica of different natures: oxidized porous silicon, amorphous thin films, nanopowders, and nanoporous sol–gel-derived ceramics. The correlations of processing conditions with emission/excitation spectral properties, relaxation kinetics, and photoluminescence photodegradation behaviors are analyzed. Following the evolution of the photoluminescence (PL) through the “from-bottom-to-up” synthesis procedure, the transformation of molecular-like ultraviolet emission of organic precursor into visible emission of carbon nanoparticles is demonstrated. At the end of the review, a novel method for the synthesis of luminescent and transparent composites, in form of nanoporous silica filled with luminescent carbon nanodots, is presented. A prototype of white light emitting devices, constructed on the basis of such luminophores and violet light emitting diodes, is demonstrated.

scholarly journals Molecular design of efficient yellow- to red-emissive alkynylgold(iii) complexes for the realization of thermally activated delayed fluorescence (TADF) and their applications in solution-processed organic light-emitting devices

2021 ◽  
Author(s):  
Cathay Chai Au-Yeung ◽  
Lok-Kwan Li ◽  
Man-Chung Tang ◽  
Shiu-Lun Lai ◽  
Wai-Lung Cheung ◽  
...  
Keyword(s):  
Molecular Design ◽  
Delayed Fluorescence ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Thermally Activated ◽  
New Class ◽  
Organic Light ◽  
Tunable Emission

We report the design of a new class of fused heterocyclic alkynyl ligand-containing gold(iii) complexes, which shows tunable emission colors spanning yellow to red region and exhibits thermally activated delayed fluorescence (TADF) properties.

Synthesis and characterization of YAG:Ce phosphors for white LEDs

2015 ◽  
Vol 23 (4) ◽  
Author(s):  
V. Tucureanu ◽  
A. Matei ◽  
A.M. Avram
Keyword(s):  
Sol Gel ◽  
Luminescent Properties ◽  
Blue Shift ◽  
Temperature Treatment ◽  
Yttrium Aluminium Garnet ◽  
White Leds ◽  
Light Emitting Devices ◽  
Co Doping ◽  
Co Precipitation ◽  
Average Size

AbstractWorldwide commercial interest in the production of cerium doped yttrium aluminium garnet (YAG:Ce) phosphors is reflected in the widespread use of white light emitting devices. Despite of the fact that YAG:Ce is considered a “cool phosphor” it is the most important in white LED technology. This article reviews the developed techniques for producing phosphors with superior photoluminescence efficiency, including solid-state reaction, sol-gel and (co)precipitation methods. Also, by co-doping with rare earth elements, a red/blue shift is reached in the spectrum. The characteristics of YAG:Ce phosphors are investigated because the properties of the phosphors are strongly influenced by the synthesis routes and the sintering temperature treatment. After the phase analysis, morphology and emission studies of the phosphors there may be seen the conditions when the transition from the amorphous phase to the crystalline phase appears, when luminescent properties are influenced by the crystalline form, purity, average size of the particles, co-doping and so on.

Synthesis and photo- and electro-luminescent properties of Ir(iii) complexes attached to polyhedral oligomeric silsesquioxane materials

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80572-80582 ◽  
Author(s):  
Tianzhi Yu ◽  
Xin Wang ◽  
Wenming Su ◽  
Chengcheng Zhang ◽  
Yuling Zhao ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Polyhedral Oligomeric Silsesquioxane ◽  
Luminescent Properties ◽  
Thermal Stabilities ◽  
Solution Processed ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Oligomeric Silsesquioxane

Two new POSS materials with an emissive Ir(iii) complex and carbazole units were successfully synthesized. Their photophysical and electrochemical properties, thermal stabilities and solution processed light-emitting devices were investigated.

scholarly journals Luminescent properties of benzothiazole derivatives and their application in white light emission

RSC Advances ◽  
2017 ◽  
Vol 7 (7) ◽  
pp. 4196-4202 ◽  
Author(s):  
Fengxian Lu ◽  
Rui Hu ◽  
Shuangqing Wang ◽  
Xudong Guo ◽  
Guoqiang Yang
Keyword(s):  
Energy Transfer ◽  
White Light ◽  
Light Emission ◽  
Luminescent Properties ◽  
Simple Approach ◽  
White Light Emission ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Benzothiazole Derivatives ◽  
Pmma Matrix

A saturated white-light emission was obtained by dispersing three benzothiazole analogues into a solid PMMA matrix. This skillfully avoids the detrimental energy transfer between doped dyes providing a simple approach for fabrication of white-light emitting devices.

Synthesis and Luminescent Properties of Mn2+-Doped Zinc Silicate Phosphors by Sol-Gel Method

2010 ◽  
Vol 434-435 ◽  
pp. 214-216 ◽  
Author(s):  
Ji Ming Zhang ◽  
Dong Lin Zhao ◽  
Zeng Min Shen
Keyword(s):  
Sol Gel ◽  
Green Light ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Nano Particles ◽  
Light Emitting ◽  
Gel Method ◽  
Sol Gel Method ◽  
Structural Details ◽  
Xrd Patterns

Abstract. Green light emitting Mn2+-doped Zn2SiO4 (Zn2SiO4:Mn2+) phosphor nano-particles were synthesized by sol-gel method combined with a furnace firing from the sol-gel solution made with ZnO, MnCO3 and tetraethoxysilan. The influences of annealing temperatures on the microstructures and photoluminescent properties of the Zn2SiO4:Mn2+ phosphors were investigated. The structural details of the phosphors were examined through XRD and SEM. The photoluminescent properties of the Zn2SiO4:Mn2+ phosphors were characterized by excitation and emission spectra. The results indicate that the XRD patterns of the Zn2SiO4:Mn2+ phosphors exhibit a willemite structure (-Zn2SiO4). Green photoluminescence whose emission peak is located at 525 nm were observed from the synthesized phosphor particles under UV excitation. The photoluminescent mechanisms of the Zn2SiO4:Mn2+ phosphors were discussed.

scholarly journals Characterization and luminescent properties of zinc–Schiff base complexes for organic white light emitting devices

2015 ◽  
Vol 1 (1) ◽  
pp. 1079291 ◽  
Author(s):  
Vandna Nishal ◽  
Devender Singh ◽  
Raman Kumar Saini ◽  
Vijeta Tanwar ◽  
Sonika Kadyan ◽  
...  
Keyword(s):  
Schiff Base ◽  
White Light ◽  
Luminescent Properties ◽  
Schiff Base Complexes ◽  
Light Emitting ◽  
Light Emitting Devices

scholarly journals A Mini Review on pH-Sensitive Photoluminescence in Carbon Nanodots

2021 ◽  
Vol 8 ◽  
Author(s):  
Cui Liu ◽  
Fang Zhang ◽  
Jiao Hu ◽  
Wenhui Gao ◽  
Mingzhen Zhang
Keyword(s):  
Optical Properties ◽  
Low Cost ◽  
Ph Sensitive ◽  
Research Progress ◽  
Future Research ◽  
Carbon Nanodots ◽  
Ph Sensing ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Wide Range

Carbon nanodots (C-dots) with sp2/sp3 framework and diameter of <10 nm contain abundant functional groups or polymers on their surface. C-dots have attracted immense attention because of their unique optical properties, excellent biocompatibility, facile preparation, and low cost. With these merits, C-dots have been used in a wide range of applications including sensing, bioimaging, catalysis, and light-emitting devices. C-dots exhibit good optical properties, such as tunable emission wavelength, good photostability, nonblinking, up-conversion emission, etc. Of note, C-dots show intrinsic pH-sensitive photoluminescence (PL), indicating their great potential for pH sensing, especially in biotic pH sensing. In this review, we systematically summarize the pH-sensitive PL properties and the pH-sensitive PL mechanism, as well as recent research progress of C-dots in pH sensing. The current challenges of pH-sensitive C-dots and their future research focus are also proposed here. We anticipate this review might be of great significance for understanding the characteristics of pH-sensitive C-dots and the development of photoluminescent nanomaterials with pH-sensitive properties.

Properties of White Light Emitting Eu2+ , Mn2+ Co-Doped Ca2SiO3Cl2 Phosphors Synthesized with Sol-Gel Method

2011 ◽  
Vol 239-242 ◽  
pp. 612-615 ◽  
Author(s):  
Qing Ju Ning ◽  
Bang Qing Wang ◽  
Su Hang Gu ◽  
Fang Fang Guo
Keyword(s):  
Emission Spectrum ◽  
White Light ◽  
Sol Gel ◽  
Luminescent Properties ◽  
X Ray Diffraction ◽  
Transfer Energy ◽  
Light Emitting ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Doped

The luminescent properties of Eu2+, Mn2+co-doped Ca2SiO3Cl2phosphors synthesized by the sol-gel method were investigated. The crystal structure, pattern and luminescence properties were characterized by the X-ray diffraction (XRD), scanning electron microscope (SEM), and photoluminescence (PL) testing. The result showed that pure Ca2SiO3Cl2was prepared at 570°C for 8h in the active carbon weak reducing atmosphere. The phosphor particles showed Eu2+by the excitation spectrum located at 365nm found that spectra with an emission peak located at a 446nm and the other emission spectrum was dominated by the green peak located at 497nm. Due to the Eu2+center transfer energy to the Mn2+center that there be an emission spectrum peak located at 580nm. Three of emission spectrum peaks stacking to white light.

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