Scientists encapsulate quantum dots in salt
October 29, 2020
Currently, the technology that exists on televisions is something surprising. Every detail changes complement the way of watching. There are televisions whose images are so high quality that it is inexplicable.
There is a technology called Organic Light Emitting Diode (OLED), it is a type of technology improved from what we know as Light Emitting Diode (LED).
Currently, it is the most modern one related to television. A disadvantage is that this technology, which is still very expensive to produce an OLED television and there are also a few brands that are investing in this technology.
There is a big difference between an OLED TV for LED. Therefore, we will show your main differences simply and practically, so that you understand how technology is revolutionizing the way of watching.
Operation of an OLED TV and a LED TV
As we have seen, one difference between one TV and another is quality. The most common, the LED TV is an LED-backlit LCD TV. This means that there are two models that each have a liquid crystal display (LCD) on the front and also on the rear.
Known as LCD, a technology that is already old and currently known as LED. The main difference between them is the lamp used.
OLED TVs have their technology. This TV has its panel, the organic material emits light from an electric current, so there is no need for backlighting.
For the reason of not needing a liquid crystal display, the energy consumption is lower and also its designer is thinner because the diodes are less than the LED lamps.
The main advantages and disadvantages of an OLED TV and a LED TV
Some factors are very important when choosing a television. Even the most technological ones have disadvantages and the simple ones also have their advantages.
The OLED model has a much superior image, its contrast, brightness, and viewing angle, and it has black with a better quality instead of a gray color.
Another great advantage is that it has the possibility of creating flexible screens and with that having televisions are with a more curvy and more resistant design.
A negative point of OLED is its time of use. Compared to LED models, its useful life is much shorter. An OLED can last an average of 14,000 hours, while LED ones are almost twice as long.
Another factor that LEDs have an advantage is the price issue. OLED TVs are still something that few can afford. Over time, its cost will decrease, as other technologies will emerge.
Quantum dots in salt on OLED TVs
There is a technique under development that creates the possibility that QLED TVs are superior and cheaper than OLED TVs.
As we saw earlier, one of the weaknesses of OLED TV is precisely its price and also reduced manufacturing by its manufacturers.
Something simple like dipping an apple in salted water will cause the fruit to oxidize and become dark, but other functions that salt does that we still don’t know about.
According to the team of researchers from Professor Chen Hsueh-Shih of the Department of Materials Science and Engineering at Tsing Hua National University in Taiwan, there is the possibility of protecting materials with quantum dots (QD).
Through a technology that uses inkjet along with saltwater, it can encapsulate elements such as QD, improving corrosion resistance, and it can also be uniformly printed on a flexible plastic film in a micro-LED matrix for use on screens.
For the design to be thinner, more flexible, with better brightness, and for the service life to be close to or longer than an LED TV, large companies are making many investments to create screens that have succeeded in replacing OLED screens.
A huge challenge to get the LEDs
It seems simple, but it is a huge challenge to get the LEDs to be organized on a surface. For Chen, manufacturers use a way of stamping that makes the millions of green, blue, and red micro LEDs crawl onto a substrate. However, a point that needs to be very careful is that if the LEDs do not stick, the screen will have spots. Salt makes LED distribution more efficient.
One way to correct the previously occurring problem is to use inkjet printing to print micro pixels instead of moving micro LEDs.
However, when the QD element leaves the printer, droplet convection occurs inside it, causing the material to go to the ends, and thus the distribution is disproportionate, leaving a lighter color in the middle and darker at the ends.
One solution to this problem was to put salt in the QD composition, making the solution uniform.
With that, the team of Prof. Hsueh-Shih Chen made a breakthrough by adding inorganic salt to quantum dot (QD) paints. The study analyzed that when adding salt to the QD element, there is a reduction in the size of the droplets sprayed by the inkjet printer, this increases the accuracy.
In a matter of time, these TVs will have a longer duration and an even better quality, being able to be accessible to more users.