scholarly journals Fabrication of Thin Films from Powdered Cesium Lead Bromide (CsPbBr3) Perovskite Quantum Dots for Coherent Green Light Emission

ACS Omega ◽  
2020 ◽  
Vol 5 (46) ◽  
pp. 30111-30122 ◽  
Author(s):  
Saif M. H. Qaid ◽  
Hamid M. Ghaithan ◽  
Bandar Ali Al-Asbahi ◽  
Abdulaziz Alqasem ◽  
Abdullah S. Aldwayyan
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Light Emission ◽  
Green Light ◽  
Green Light Emission ◽  
Lead Bromide ◽  
Perovskite Quantum Dots

Blue-Green Light Emission from Self-Assembled Bipyridinium Thin Films

1998 ◽  
Vol 27 (9) ◽  
pp. 909-910 ◽  
Author(s):  
Haipeng Zheng ◽  
Ruifeng Zhang ◽  
Ying Wu ◽  
Jiacong Shen
Keyword(s):  
Thin Films ◽  
Light Emission ◽  
Green Light ◽  
Green Light Emission ◽  
Self Assembled

scholarly journals Highly pure green light emission of perovskite CsPbBr_3 quantum dots and their application for green light-emitting diodes

2016 ◽  
Vol 24 (13) ◽  
pp. 15071 ◽  
Author(s):  
Cunlong Li ◽  
Zhigang Zang ◽  
Weiwei Chen ◽  
Zhiping Hu ◽  
Xiaosheng Tang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Emitting Diodes ◽  
Light Emission ◽  
Green Light ◽  
Light Emitting ◽  
Green Light Emission

STRUCTURAL, ELECTRICAL AND OPTICAL PROPERTIES OF TiO2THIN FILM DEPOSITED ON THE NANO POROUS SILICON TEMPLATE

2017 ◽  
Vol 24 (Supp02) ◽  
pp. 1850017
Author(s):  
MAHMOOD BAHAR ◽  
ENSIEH KHALILI DERMANI
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Porous Silicon ◽  
Light Emission ◽  
Electrochemical Etching ◽  
Green Light ◽  
Blue Emission ◽  
Band Gap Energy ◽  
X Ray Diffraction ◽  
Green Light Emission

The porous silicon (PSi), which is produced by the electrochemical etching, has been used as a substrate for the growth of the titanium oxide (TiO2) thin films. By using the EBPVD method, TiO2thin films have been deposited on the surface of the PSi substrate. TiO2/PSi layers were annealed at the temperature of 400[Formula: see text]C, 500[Formula: see text]C and 600[Formula: see text]C for different tests. The morphology and structures of layers were investigated by the scanning electron microscopy (SEM) and X-ray diffraction (XRD). The current–voltage characteristic curves of samples and the ideality factor of heterojunction were studied. The results showed that the electrical properties of the samples change with increase in the annealing temperature. The optical properties of the prepared samples were investigated by using UV–Vis and photoluminescence (PL) spectroscopy. Green light emission of the PSi combined with the blue light and violet–blue emission obtained from the TiO2/PSi PL spectra. The results showed that the optical band gap energy of the PSi has increased from 1.86[Formula: see text]eV to 2.93[Formula: see text]eV due to the deposition of TiO2thin film.

scholarly journals Remarkable photoluminescence enhancement of CsPbBr3 perovskite quantum dots assisted by metallic thin films

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wenchao Zhao ◽  
Zhengji Wen ◽  
Qianqian Xu ◽  
Ziji Zhou ◽  
Shimin Li ◽  
...  
Keyword(s):  
Thin Films ◽  
Quantum Dots ◽  
Quantum Efficiency ◽  
Light Emission ◽  
Luminescent Properties ◽  
Dielectric Substrate ◽  
Excitation Wavelength ◽  
Metallic Thin Films ◽  
Fabry Perot ◽  
Perovskite Quantum Dots

Abstract All-inorganic cesium lead halide perovskite quantum dots have recently received much attention as promising optoelectronic materials with great luminescent properties and bright application prospect in lighting, lasing, and photodetection. Although notable progress has been achieved in lighting applications based on such media, the performance could still be improved. Here, we demonstrate that the light emission from the perovskite QDs that possess high intrinsic luminous efficiency can be greatly enhanced by using metallic thin films, a technique that was usually considered only useful for improving the emission of materials with low intrinsic quantum efficiency. Eleven-fold maximal PL enhancement is observed with respect to the emission of perovskite QDs on the bare dielectric substrate. We explore this remarkable enhancement of the light emission originating from the joint effects of enhancing the incident photonic absorption of QDs at the excitation wavelength by means of the zero-order optical asymmetric Fabry–Perot-like thin film interference and increasing the radiative rate and quantum efficiency at the emission wavelength mediated by surface plasmon polaritons. We believe that our approach is also potentially valuable for the enhancement of light emission of other fluorescent media with high intrinsic quantum efficiency.

scholarly journals Degradation dynamics of quantum dots in white LED applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hsiao-Chien Chen ◽  
Abdul Shabir ◽  
Cher Ming Tan ◽  
Preetpal Singh ◽  
Jia-Hung Lin
Keyword(s):  
Quantum Dots ◽  
Light Intensity ◽  
White Light ◽  
Density Functional ◽  
Light Emission ◽  
Green Light ◽  
Blue Shift ◽  
Practical Applications ◽  
Initial Stage ◽  
Green Light Emission

AbstractQuantum Dots (QDs) are being investigated in a hybrid white light LED structure which inculcates phosphor in the package with a blue LED chip as the light source recently. In this work, Zn doped CdS QD with ZnS shell together with green light emission phosphor is used. Upon prolonged operation, degradation of the LEDs due to the degradation of QDs is observed, which can limit its practical applications. The degradation includes intensity reduction as well as blue shift of the emitted wavelength from the white light. Three stages of degradation are observed, namely an enhancement state where light intensity is found to increase, followed by a rapid degradation stage where light intensity decreases rapidly, and finally a slower degradation stage where the degradation rate of light intensity slows down and continues till the end of the test. Through various detail material analysis, with confirmation from the density functional theory (DFT) calculations, we find that the degradation of the LEDs is due to the time evolving degradation of CdS core structure, beginning from the oxidation of sulfur vacancy of CdS QDs by the nearby oxygen atoms as a result of imperfection of the ZnS protective coating around the QDs in the presence of blue light. This oxidation renders a transformation of CdS into CdO at the initial stage. The final stage is the formation of CdSO4 via some intermediate processes.

Colour- and structure-stable CsPbBr3-CsPb2Br5 compounded quantum dots with tuneable blue and green light emission

2018 ◽  
Vol 767 ◽  
pp. 98-105 ◽  
Author(s):  
Pengjie Song ◽  
Bo Qiao ◽  
Dandan Song ◽  
Zhiqin Liang ◽  
Di Gao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Light Emission ◽  
Green Light ◽  
Green Light Emission
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