A seed-mediated and double shell strategy to realize large-size ZnSe/ZnS/ZnS quantum dots for high color purity blue light-emitting diodes

Nanoscale ◽  
2021 ◽  
Author(s):  
Zhiwen Yang ◽  
Qianqian Wu ◽  
Xiaochuan Zhou ◽  
Fan Cao ◽  
Xuyong Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Light Emitting Diode ◽  
Electroluminescence Spectrum ◽  
Color Purity ◽  
Half Maximum ◽  
Light Emitting ◽  
Large Size ◽  
Seed Mediated ◽  
High Color Purity

Blue ZnSe/ZnS/ZnS quantum dots were prepared using a seed-mediated and double shell strategy, and the quantum dot-based light-emitting diode with electroluminescence spectrum peaked at 446 nm and full widths at half-maximum of 16 nm was fabricated.

65‐3: Quantum Dot Light‐emitting Diodes with High Color Purity RGB Cadmium‐Free Quantum Dots

2021 ◽  
Vol 52 (1) ◽  
pp. 953-956
Author(s):  
Tatsuya Ryowa ◽  
Yusuke Sakakibara ◽  
Tadashi Kobashi ◽  
Keisuke Kitano ◽  
Masaya Ueda ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Light Emitting Diodes ◽  
Color Purity ◽  
Light Emitting ◽  
High Color Purity

Analysis of various solvent effects to quantum dots for bilayer quantum dot light-emitting diode

2021 ◽  
Author(s):  
Jae-In Yoo ◽  
Suk-Ho Song ◽  
Jae-Peel Chung ◽  
Zhang Yi ◽  
Sung-Jae Park ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Solvent Effects ◽  
Light Emitting Diode ◽  
Light Emitting

All-solution processed inverted green quantum dot light-emitting diodes with concurrent high efficiency and long lifetime

2019 ◽  
Vol 6 (10) ◽  
pp. 2009-2015 ◽  
Author(s):  
Zhiwen Yang ◽  
Qianqian Wu ◽  
Gongli Lin ◽  
Xiaochuan Zhou ◽  
Weijie Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Shell Growth ◽  
Solution Processed ◽  
Light Emitting ◽  
Long Lifetime

An all-solution processed inverted green quantum dot-based light-emitting diode with concurrent high efficiency and long lifetime is obtained by precisely controlled double shell growth of quantum dots.

Improved Efficiency and High Color Purity of Top-Emission White Organic Light Emitting Diode by Anode Oxidation Technique

2010 ◽  
Vol 13 (11) ◽  
pp. J132
Author(s):  
Ying-Nan Lai ◽  
Wei-Chou Hsu ◽  
Ching-Sung Lee ◽  
Ching-Wu Wang ◽  
Chiu-Sheng Ho ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Color Purity ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light ◽  
Anode Oxidation ◽  
High Color Purity

scholarly journals 23% power conversion efficiency light-emitting diodes using monolayer quantum dots

2021 ◽  
Author(s):  
Fengjia Fan ◽  
Yan Gao ◽  
Xiaonan Liu ◽  
Bo Li ◽  
Huaibin Shen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Bias Voltage ◽  
Light Emitting Diodes ◽  
Light Emitting Diode ◽  
Power Conversion ◽  
Hole Transport ◽  
Light Emitting ◽  
Large Size ◽  
Recombination Current ◽  
Conversion Efficiencies

Abstract Ever since the first proposal of using colloidal quantum dots (QDs) as the active emitting layer of light-emitting diode (LED), a monolayer of QD is considered as a better option than the multilayer ones. Owing to the slow charge transport rate among different QD layers, quantum dot light-emitting diodes (QLEDs) adopting multilayer QDs need to be driven at higher than the bandgap bias voltage to achieve practically useful brightness, resulting in increased power consumptions and heat generations, and reduced device lifetimes. Unfortunately, QLEDs using monolayer QDs always suffer from unwanted recombination in hole transport layers (HTLs) and low external quantum efficiencies (EQEs) as a result of electron overflow from QDs into HTLs. Herein, we tackle this dilemma by packing QDs with large size into monolayers, which enables us to mitigate the unwanted electron overflow and retain high EQE. More importantly, it further allows us to boost the irradiative recombination current at bandgap voltage. By virtue of simultaneously obtained high EQE and irradiative recombination rate, we can achieve brightness of 1,100 cd m-2 and 3,000 cd m-2 at 100% and 105% bandgap voltages with record high power conversion efficiencies (PCEs) of 23% and 22%, respectively. Since heat generation has been depressed and devices can be operated at reduced bias voltage, they show unprecedented T95 operation lifetimes (the time for the luminance to decrease to 95% of the initial value) of more than 4,000 h with an initial brightness of 3,000 cd m-2, and equivalent T95 lifetimes of more than 20,000 h at 1,000 cd m-2.

A novel inequivalent double-site substituted red phosphor Li4AlSbO6:Mn4+ with high color purity: Structure, photoluminescence properties, and application in warm white LEDs

2021 ◽  
Author(s):  
Zhiyuan Li ◽  
Xuhui Zhang ◽  
Ji Wu ◽  
Rui Guo ◽  
Lan Luo ◽  
...  
Keyword(s):  
Rare Earth ◽  
Spectral Properties ◽  
Light Emitting Diode ◽  
Color Purity ◽  
Photoluminescence Properties ◽  
Red Phosphor ◽  
Light Emitting ◽  
White Leds ◽  
Red Phosphors ◽  
High Color Purity

Non-rare-earth Mn4+-doped oxide red phosphors received increasing attention in the white light-emitting diode (LED) field for their admirable chemical stability and spectral properties. Here, a new inequivalent double-site substituted Mn4+-doped...

Effect of CdSe/ZnS quantum dots on color purity and electrical properties of polyfluorene based hybrid light emitting diode

2016 ◽  
Vol 34 ◽  
pp. 276-283 ◽  
Author(s):  
Nidhi Gupta ◽  
Rakhi Grover ◽  
Dalip Singh Mehta ◽  
Kanchan Saxena
Keyword(s):  
Quantum Dots ◽  
Electrical Properties ◽  
Light Emitting Diode ◽  
Color Purity ◽  
Light Emitting
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