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efficient white leds using liquid-state magic-sized cdse quantum dots

by:Dolight LED Panel     2019-09-30
The Magic clusters attract a lot of interest to explore the dynamics of quantum dots (QD)
Nuclear and growth.
At the same time, there is a magic --
The size of the QDs shows the broadband emission of the visible wavelength region, which is advantageous to provide a single-
The type of nano-materials and the high discoloration ability of white light
LEDs (LEDs).
Here we optimize the quantum production of magic.
By controlling the synthesis parameters, the size can be up to 22% without any shelling or later
Process and integrate it into the liquid
Status on the blue LED to prevent a decrease in efficiency due to the hostMaterial effect.
White LED display color manufactured-
Rendering Index and luminous efficiency up to 89 and 11.
7lm lm/W, respectively. Quantum dots (QDs)
It is formed by the molecular evolution into a crystalline nano-solid.
In these nanosolids, the magic cluster or the Magic --
The size of the nanoparticles attracts a lot of attention to understand the non-
Classical morphology and growth of Controllable synthesis of inorganic nanoparticles.
According to the closed geometry-
Stacked nanoclusters, which are composed of a specific number of atoms due to a high degree of thermodynamic stability, and show uneven growth, indicating a structure from one with a specific number of atoms to another
So these magic
The size of QDs is used as seeds to grow foreign structures such as nano-rods, tetrapods, bands, nano-platelets, tablets and bands.
White launch from Magic
The size of QDs is due to their surface traps-states.
On the surface of the selenium-cadmium QDs, there are some uncoordinated Se atoms that will provide the electron and hole trap states within the band gap region and can be considered as hanging bonds.
Range of radiation recombination in traps
Will lead to white emissions (Fig. ).
Magic-in addition to the structural properties-
The Larger QDs have a high surface volume ratio, which results in a high density of traps
State of the surface.
Trap, in general-
Due to the state in the QDs, the photoelectric device application is inefficient and therefore not ideal.
Because of this, trap
By binding the appropriate ligand on the surface or by the growth of the shell layer, the state becomes passive.
The difference is that trap
Magic state-
Size QDs display broadband surface
State emission covering the entire visible area, available for light-
LEDs (LEDs).
The advantage is that they benefit from a simple core structure with another traditional QD-
White-based led using two or more QD layers.
In addition to being integrated, the simple synthesis of these nano-materials can enhance their use in LED applications.
For this, magic-
The larger-sized selenium-cadmium QDs are suitable nano-materials that can be integrated and synthesized at the same time.
However, the quantum yield of Magic
The larger size of selenium, cadmium, QDs has poor performance, and the white led made from it has low efficiency.
Schreuder and co-
Worker synthetic Supersmall white-
To ~ The quantum yield of 4% emitted Cadmium Selenium and cadmium QDs.
Later, they increased the quantum yield.
After about two days, increase the small Selenium Cadmium QDs to 45% withtreatment;
Even with this treatment, the predicted level of luminous efficiency of white LEDs is still only 3. 8u2009lm/W.
In addition to Cadmium Selenium, QDs, Sapra and co-
Worker synthetic White
CdS QDs with a quantum yield of 17%. Organic-
White, white, white
The emission layer class perovskite with a quantum yield of 9% was also studied.
Besides, Magic
By Mn doping, the structure of zinc-cadmium alloy with a maximum quantum yield of 6% was obtained.
Efficient White recently-
The emission core/shell QDs was reported, which was prepared with a synthesis procedure that requires Mn doping on copper gallium sulfur QDs and additional growth on nuclear QDs
Despite concerns about the industrial use of cadmium
Nano-material-based devices continue to attract significant scientific attention from led due to their toxic substance content and their superior optical properties.
Unlike previous studies, we maximize White-
By controlling the synthesis parameters of the reaction time and temperature to emit Cadmium Selenium QDs, the quantum yield is up to 22% in the absence of a shell formation or White led post-processing process.
In order to prevent the attenuation of QD efficiency in the device structure that may be caused by the host material effect, we are in the liquid-
It is stated on the blue LED chip that the chip causes white led, with a color change index of up to 89 at a high current injection level of 0 and a luminous efficiency of about 10 lm/W.
1 a, higher than the previous study (Table).
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