Microstructure and enhanced photoluminescence of ZnO/V2O5 composite

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744051
Author(s):  
Xinghua Zhan ◽  
Fei Chen ◽  
Zoran Salcic ◽  
Chee Cheong Wong ◽  
Wei Gao
Keyword(s):  
Zinc Oxide ◽  
Optical Properties ◽  
High Efficiency ◽  
Light Emission ◽  
Coupling Effect ◽  
Light Emitting ◽  
Vertical Deposition ◽  
Enhanced Photoluminescence ◽  
Zno Particles ◽  
New Type

Submicron zinc oxide (ZnO) spheres prepared by a two-stage hydrothermal method were assembled into a layer on a substrate by vertical deposition. Vanadium pentoxide (V2O5) was deposited onto the top of ZnO spheres by magnetron sputtering followed by annealing in oxygen atmosphere at 500[Formula: see text]C for an hour. The microstructures and optical properties of the prepared samples were investigated. The photoluminescence (PL) results indicate that the intensity of PL in the annealed ZnO/V2O5 composite microstructures is dramatically improved compared to the constituent V2O5 and ZnO spheres. The intensity enhancement of light emission from the ZnO/V2O5 composite may be attributed to the special microstructure of ZnO particles and the coupling effect between ZnO and V2O5. This transition oxide composite may possibly be developed into a new type of high-efficiency light emitting material.

A high-efficiency white light-emitting lanthanide–organic framework assembled from 4,4′-oxybis(benzoic acid), 1,10-phenanthroline and oxalate

2014 ◽  
Vol 2 (43) ◽  
pp. 9073-9076 ◽  
Author(s):  
Dou Ma ◽  
Xia Li ◽  
Rui Huo
Keyword(s):  
Benzoic Acid ◽  
White Light ◽  
High Efficiency ◽  
Light Emission ◽  
White Light Emission ◽  
Light Emitting ◽  
Organic Framework

High-efficiency white light emission was developed through the Gd(iii)/Eu(iii)/Tb(iii) doped complex with 4,4′-oxybis(benzoic acid), 1,10-phenanthroline and oxalate.

Film Preparation Conditions and Characterization of co-Deposited Tungsten Doped Zinc Oxide Phosphor

1999 ◽  
Vol 558 ◽  
Author(s):  
Jasleen Bombra Sobti ◽  
V. Bhatia ◽  
P. M. Babuchna ◽  
Mark H. Weichold
Keyword(s):  
Zinc Oxide ◽  
Blue Light ◽  
Light Emission ◽  
Optoelectronic Device ◽  
Flat Panel Displays ◽  
Phosphor Material ◽  
Light Emitting ◽  
Preparation Conditions ◽  
Device Applications ◽  
Work Done

ABSTRACTNeed for efficient blue light emitting source for optoelectronic device applications such as flat panel displays has made the research in luminescent material ever so important. Tungsten doped zinc oxide (ZnO:W) has been identified as a blue light emitting phosphor exhibiting cathodoluminescence near 490 nm. This paper details work done on ZnO:W phosphor preparation conditions for efficient light emission from the phosphor. Material characterization to identify the possible source of blue light emission will also be discussed.

scholarly journals GaN light-emitting triodes for high-efficiency hole injection and light emission

2006 ◽  
Author(s):  
Jong Kyu Kim ◽  
J.-Q. Xi ◽  
Hong Luo ◽  
Jaehee Cho ◽  
Cheolsoo Sone ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emission ◽  
Hole Injection ◽  
Light Emitting

Tuning optical properties of CsPbBr3 by mixing Nd3+trivalent lanthanide halide cations for blue light emitting devices.

2022 ◽  
Author(s):  
Muhammad Amin Padhiar ◽  
Minqiang Wang ◽  
Yongqiang Ji ◽  
Zhi Yang ◽  
Arshad Saleem Bhatti
Keyword(s):  
Optical Properties ◽  
Blue Light ◽  
Light Emission ◽  
Low Cost ◽  
Thermal Quenching ◽  
Visible Spectrum ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Lanthanide Halide ◽  
Trivalent Lanthanide

Abstract In recent years, significant progress has been made in the red and green perovskite quantum dots (PQDs) based light-emitting devices. However, a scarcity of blue-emitting devices that are extremely efficient precludes their research and development for optoelectronic applications. Taking advantage of tunable bandgaps of PQDs over the entire visible spectrum, herein we tune optical properties of CSPbBr3 by mixing Nd3+ trivalent lanthanide halide cations for blue light-emitting devices. The CsPbBr3 PQDs doped with Nd3+ trivalent lanthanide halide cations emitted strong photoemission from green into the blue region. By adjusting their doping concentration, a tunable wavelength from (515 nm) to (450 nm) was achieved with FWHM from (37.83 nm) to (16.6 nm). We simultaneously observed PL linewidth broadening thermal quenching of PL and the blue shift of the optical bandgap from temperature-dependent PL studies. The Nd3+ cations into CsPbBr3 PQDs more efficiently reduced non-radiative recombination. As a result of the efficient removal of defects from PQDs, the photoluminescence quantum yield (PLQY) has been significantly increased to 91% in the blue-emitting region. Significantly, Nd3+ PQDs exhibit excellent long-term stability against the external environment, including water, temperature, and ultraviolet light irradiation. Moreover, we successfully transformed Nd3+ doped PQDs into highly fluorescent nanocomposites. Incorporating these findings, we fabricate and test a stable blue light-emitting LED with EL emission at (462 nm), (475 nm), and successfully produce white light emission from Nd3+ doped nanocomposites with a CIE at (0.32, 0.34), respectively. The findings imply that low-cost Nd3+ doped perovskites may be attractive as light converters in LCDs with a broad color gamut.

A Novel Silicon-Based Packaging Platform for High-Efficiency LED Modules

2011 ◽  
Vol 314-316 ◽  
pp. 359-363
Author(s):  
Cong Wang ◽  
Won Sang Lee ◽  
Nam Young Kim
Keyword(s):  
Heat Dissipation ◽  
High Efficiency ◽  
Light Emitting Diode ◽  
Chemical Vapor ◽  
Anodized Aluminum ◽  
Anodized Aluminum Oxide ◽  
Insulating Layer ◽  
Light Emitting ◽  
New Type ◽  
Silicon Based

A novel silicon-based packaging platform with the electroplated-based reflector and the electrode- guided interconnections is developed for the packaging component of a high-luminosity and high-efficiency multi-chip light-emitting diode (LED) module, which is patterned on a new type of insulating layer that consists of nanoporous anodized aluminum oxide (AAO) layer and plasma- enhanced chemical vapor deposition (PECVD) deposited silicon dioxide (SiO2) on a doped silicon substrate. The reflector and the electrical interconnections are successfully fabricated by using the electroplating method in the same body. In order to obtain the benefits of high efficiency LED modules, the requirements concerning thermal management and photomechanical layout have to be met. In this paper, we will discuss a novel fabrication method in LED module packaging platform, and then describe the thin layer of electroplated Cu/Ni/Au in order to reduce thermal resistance and to increase thermal diffusion efficiency. The heat generated by the LED chips is dissipated directly to the silicon body through the metal-plated platform, and truly excellent heat dissipation characteristics are observed. We demonstrate 987 lm 8 W-level cool-white light (5000 K, 16 V, 110 lm/W, CRI = 77) emission for 570 µm × 230 µm-chip LEDs at 600 mA operation.

scholarly journals Highly Isotactic Poly(N-butenyl-carbazole): Synthesis, Characterization, and Optical Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Antonio Botta ◽  
Vincenzo Venditto ◽  
Alfredo Rubino ◽  
Stefania Pragliola
Keyword(s):  
Optical Properties ◽  
Fluorescence Spectra ◽  
Light Emission ◽  
Organic Light Emitting Diodes ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
X Ray ◽  
Organic Light ◽  
Optical Applications ◽  
Carbazole Group

The synthesis of isotactic poly(N-butenyl-carbazole) (i-PBK) by using homogeneous isospecific Ziegler-Natta catalytic system is reported. The achieved polymer is crystalline and shows, to DSC and X-ray analysis, two distinct crystalline phases.i-PBK FTIR spectrum and X-ray diffraction pattern are compared with those of poly(N-vinylcarbazole) (PVK). The observed differences are tentatively associated with higher flexibility of thei-PBK chains due to the alkylene group connecting the carbazole group to the main chain.i-PBK optical properties are also compared with those of PVK and isotactic poly(N-pentenyl-carbazole) (i-PPK), a higher homologue ofi-PBK recently used as emitting layer in organic light emitting diodes (OLEDs) showing white light emission. The close similarity of the fluorescence spectra ofi-PBK andi-PPK is a promising basis for optical applications of this polymer.

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