Blue Graphene Quantum Dots with High Color Purity by Controlling Subdomain Formation for Light-Emitting Devices

2020 ◽  
Vol 3 (7) ◽  
pp. 6469-6477 ◽  
Author(s):  
Hyewon Yoon ◽  
Hyung Suk Kim ◽  
Jungmo Kim ◽  
Minsu Park ◽  
Byunghoon Kim ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Color Purity ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
High Color Purity

scholarly journals High Color-Purity Green, Orange, and Red Light-Emitting Diodes Based on Chemically Functionalized Graphene Quantum Dots

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Woosung Kwon ◽  
Young-Hoon Kim ◽  
Ji-Hee Kim ◽  
Taehyung Lee ◽  
Sungan Do ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Transient Absorption ◽  
Energy Levels ◽  
Red Light ◽  
Graphene Quantum Dots ◽  
Chemical Properties ◽  
Color Purity ◽  
Light Emitting ◽  
Aniline Derivatives ◽  
High Color Purity

Abstract Chemically derived graphene quantum dots (GQDs) to date have showed very broad emission linewidth due to many kinds of chemical bondings with different energy levels, which significantly degrades the color purity and color tunability. Here, we show that use of aniline derivatives to chemically functionalize GQDs generates new extrinsic energy levels that lead to photoluminescence of very narrow linewidths. We use transient absorption and time-resolved photoluminescence spectroscopies to study the electronic structures and related electronic transitions of our GQDs, which reveals that their underlying carrier dynamics is strongly related to the chemical properties of aniline derivatives. Using these functionalized GQDs as lumophores, we fabricate light-emitting didoes (LEDs) that exhibit green, orange, and red electroluminescence that has high color purity. The maximum current efficiency of 3.47 cd A−1 and external quantum efficiency of 1.28% are recorded with our LEDs; these are the highest values ever reported for LEDs based on carbon-nanoparticle phosphors. This functionalization of GQDs with aniline derivatives represents a new method to fabricate LEDs that produce natural color.

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

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.

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