Fabrication and electroluminescence properties of alloyed CdSxSe1-x quantum dots-based LEDs

2021 ◽  
Author(s):  
Huu Tuan Nguyen ◽  
Shutang Chen ◽  
Anh-Tuan Duong ◽  
Soonil Lee
Keyword(s):  
Quantum Dots ◽  
Reaction Time ◽  
Luminous Efficiency ◽  
Emission Peak ◽  
Growth Time ◽  
Full Width ◽  
Half Maximum ◽  
Maximum Luminance ◽  
Facile Synthesis ◽  
One Pot

Abstract We report the facile synthesis of alloyed CdSxSe1-x QDs via one-pot method using simultaneous injection of Se and S source into a solution of the Cd precursor dissolved in a coordinating mixture of hexadecylamine and trioctylphosphine, during which the formation of CdSxSe1-x nanocrystals was controlled by growth time at a certain temperature of 260 oC. In particular, emission peak and full width at half maximum of photoluminescence (PL) of alloyed CdSxSe1-x QDs were tunable in a range of 588 - 604 nm and 36 - 38 nm, respectively, with a PL quantum yield up to 55 % by a reaction time of 60 min. Importantly, the structural advantage of alloyed CdSxSe1-x QDs based LEDs have been fabricated and their electroluminescence properties were characterized. A good performance device with a maximum luminance and luminous efficiency of 761 cd/m2 and 0.82 cd/A was obtained, respectively.

NOVEL BLUE ORGANIC LIGHT-EMITTING MATERIAL

2004 ◽  
Vol 13 (03n04) ◽  
pp. 649-653 ◽  
Author(s):  
YUN-HI KIM ◽  
HYUNG-SUN KIM ◽  
JUN-HWAN AHN ◽  
SUNG-HAN KIM ◽  
SOON-KI KWON
Keyword(s):  
Emission Band ◽  
Blue Emission ◽  
Luminous Efficiency ◽  
Full Width ◽  
Half Maximum ◽  
Device Structure ◽  
Light Emitting ◽  
Organic Light ◽  
Chromaticity Coordinates ◽  
Narrow Emission

The blue light-emitting material was synthesized. With the non-doped, blue-emitting material in the multilayer device structure, it was possible to achieve the luminous efficiency of 3.38 cd/A at 110 mA/cm2. The EL spectrum of the ITO / CuPc / NPB / BDPSP / Alq 3/ Mg : Ag device showed a narrow emission band with full width at half maximum (FWHM) 70 nm and λ max =448.25 nm . The emitting color of the device showed the highly pure blue emission (x,y)=(0.158, 0.10) for ITO / CuPc / NPB / BDPSP / Alq 3/ Mg : Ag in CIE (Commission Internationale de l'Eclairage) chromaticity coordinates.

scholarly journals Facile Synthesis of Spiro[cyclohexane-1,3’-indoline]-2,2’-diones

2019 ◽  
Vol 25 (1) ◽  
pp. 157-161 ◽  
Author(s):  
Shin-taro Katayama ◽  
Hiroshi Nishino
Keyword(s):  
Natural Products ◽  
Reaction Time ◽  
Total Synthesis ◽  
Facile Synthesis ◽  
One Pot ◽  
Short Reaction Time ◽  
High Yields

AbstractSpiro[cyclohexane-1,3’-indoline]-2,2’-diones were easily prepared in good to high yields by the oxidation of N-aryl-N-methyl-2-oxocyclohexane-1-carboxamides in one pot with a short reaction time. The spiroindolinediones could be important for the total synthesis of natural products.

FACILE SYNTHESIS OF COLLOIDAL PbS QUANTUM DOTS

2012 ◽  
Vol 11 (06) ◽  
pp. 1240041
Author(s):  
CHAO LIU ◽  
YANG JIANG ◽  
JIAN HUANG ◽  
HONGYAN DUAN
Keyword(s):  
Quantum Dots ◽  
Heating Temperature ◽  
Growth Time ◽  
Photovoltaic Devices ◽  
X Ray Diffraction ◽  
Facile Synthesis ◽  
X Ray ◽  
Transmission Electron ◽  
20 Nm ◽  
Pbs Quantum Dots

Lead sulfide ( PbS ) quantum dots (QDs) capped with oleic acid and oleic amine were synthesized by using safe and innocuous sulfur powder as S source instead of the bis (trimethylsilyl) sulfide ((TMS)2S). QDs with size distribution from 20 nm to 3 nm were gained by controlling the experiment parameters such as heating temperature, capping agents and the growth time. The morphology and crystal structure of the as-prepared PbS QDs were characterized by (high-resolution) transmission electron microscopy (HR-TEM) images and powder X-ray diffraction (XRD). This method may offer a new route to synthesize PbS QDs for photovoltaic devices.

Infrared Luminescence from MOCVD Gan

1994 ◽  
Vol 339 ◽  
Author(s):  
M. W. Leksono ◽  
C. H. Oiu ◽  
W. Melton ◽  
J. I. Pankove
Keyword(s):  
Infrared Emission ◽  
Emission Peak ◽  
Full Width ◽  
Half Maximum ◽  
Yellow Luminescence ◽  
Infrared Luminescence ◽  
Gan Film

ABSTRACTAn infrared emission peak at 1.25 eV is observed from a GaN film which exhibits strong yellow luminescence peaking at 2.15 eV. It is most efficient at a temperature of 160 K. The full width at half maximum (FWHM) of the IR peak is 0.17±0.01 eV, which is about 1/3 that of the yellow peak.

Facile synthesis of silver sulfide quantum dots by one pot reverse microemulsion under ambient temperature

2019 ◽  
Vol 242 ◽  
pp. 143-146 ◽  
Author(s):  
Jing Xue ◽  
Hailong Li ◽  
Jixian Liu ◽  
Yao Wang ◽  
Yuanmeng Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ambient Temperature ◽  
Silver Sulfide ◽  
Reverse Microemulsion ◽  
Facile Synthesis ◽  
One Pot

scholarly journals Enhanced Air Stability of Perovskite Quantum Dots by Manganese Passivation

Technologies ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 10
Author(s):  
Ryota Sato ◽  
Kazuki Umemoto ◽  
Satoshi Asakura ◽  
Akito Masuhara
Keyword(s):  
Quantum Dots ◽  
Thermal Conditions ◽  
The Other ◽  
Quantum Yields ◽  
Full Width ◽  
Half Maximum ◽  
Air Humidity ◽  
Passivating Layer ◽  
Perovskite Quantum Dots ◽  
Color Tunability

Organic-inorganic perovskite quantum dots (PeQDs) have attracted attention due to their excellent optical properties, e.g., high photoluminescence quantum yields (PLQYs; >70%), a narrow full width at half maximum (FWHM; 25 nm or less), and color tunability adjusted by the halide components in an entire tunability (from 450 nm to 730 nm). On the other hand, PeQD stability against air, humidity, and thermal conditions has still not been enough, which disturbs their application. To overcome these issues, with just a focus on the air stability, Mn2+ ion passivated perovskite quantum dots (Mn/MAPbBr3 QDs) were prepared. Mn2+ could be expected to contract the passivating layer against the air condition because the Mn2+ ion was changed to the oxidized Mn on PeQDs under the air conditions. In this research, Mn/MAPbBr3 QDs were successfully prepared by ligand-assisted reprecipitation (LARP) methods. Surprisingly, Mn/MAPbBr3 QD films showed more than double PLQY stability over 4 months compared with pure MAPbBr3 ones against the air, which suggested that oxidized Mn worked as a passivating layer. Improving the PeQD stability is significantly critical for their application.

Facile synthesis of noncytotoxic PEGylated dendrimer encapsulated silver sulfide quantum dots for NIR-II biological imaging

Nanoscale ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 5678-5684 ◽  
Author(s):  
Pragati Awasthi ◽  
Xinyi An ◽  
Jiajia Xiang ◽  
Nagendra Kalva ◽  
Youqing Shen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Silver Sulfide ◽  
Biological Imaging ◽  
Water Soluble ◽  
Fluorescence Property ◽  
Facile Synthesis ◽  
One Pot

The water-soluble PEG-PATU Ag2S QDs have been successfully prepared by one-pot method, which display the favorable NIR-II fluorescence property for in vivo bioimaging.

scholarly journals Environmentally friendly quantum-dot color filters for ultra-high-definition liquid crystal displays

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Yun-Hyuk Ko ◽  
Prem Prabhakaran ◽  
Sinil Choi ◽  
Gyeong-Ju Kim ◽  
Changhee Lee ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Liquid Crystal ◽  
Quantum Dot ◽  
Color Space ◽  
Liquid Crystal Displays ◽  
Superior Performance ◽  
Color Filter ◽  
Full Width ◽  
Half Maximum ◽  
High Definition

Abstract This work reports the synthesis and application of highly tuned cadmium-free green and red InPZnSe1−xSx/ZnS quantum dots (QDs) in QD enhanced liquid crystal displays (LCD). The emissions of the quantum dots were synthetically tuned to sharp emissions at low full-width at half maximum. The QDs were incorporated in LCD devices as quantum dot enhancement film (QDEF) or as a quantum dot incorporated color filter (QDCF). Synthetic tuning of the gradient inter-shell in the QDs leads to reduced full width at half-maximum, resulting in sharp green and red emissions from both types of devices. The application of the same QDs to devices using these different integration techniques shows the superiority of QDCF devices over QDEF ones. The RGB color gamut of a QDCF-LCD was 81.4% of REC.2020 in the CIE 1931 color space compared to 71.2% obtained for a QDEF-LCD display. The improved performance of QDCF was mainly due to the optimal interactions between the green QDs and the green color filter. The superior performance of cadmium-free InPZnSe1−xSx/ZnS QDCFs in LCDs make them well-suited for ultra-high-definition TV formats.

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