Light Emitting Diodes |Chemistry in light emission electronics
Chemistry of light emission |
Chemistry of compounds with light emission has been know for a long time. For instance, some chemical compounds absorb ultra violet light or heat and emit light of a certain frequency or wavelength or color . This is known as photoluminescence. However, other chemical compounds absorb electricity and produce light of a certain frequency or wavelength or color. This is called as electroluminescence and is well known. Another situation, occur when a compound undergoes a chemical reaction and emits light. This is also know as chemiluminescence and a typical example occur in fireflies observed at night.
This occur when a chemical compound absorbs energy . The absorbed energy can promote electrons into higher energy levels. However, part of the energy is released in the form of radiation when electrons fall back to lower energy level. The other name of the higher energy level is called HOMO. This is the highest occupied molecular orbital. However , the lower energy level is called LUMO and this is the lowest unoccupied molecular orbital. This depends on the nature of the chemical compound and how these levels are positioned .
Some of the compounds have different levels for distance between the HOMO and the LUMO. This means the energy that is given out from this compounds will not be the same. This means they are going to show different colors . This is what makes them very important in making light emitting devices.
Light emitting Diodes |
These are devices that emit light when they absorption of electrical energy. The physics and engineering is well known, however the chemistry keeps evolving . This is because, chemical compounds that absorb electricity and emit light can be made in different ways. This is done to improve on the previous or existing compounds. This in turn, will help to improve on existing or future technology.
Red , green and blue are the colors are used to make other colors. As a result , there are compounds that emit red light , while others emit green light or blue light . One of the main aim is to have a good chemical compound that emit blue light . This is because the blue light is high energy light and it is very important. The blue light emission can cause compounds to degrade so compounds that emits blue must be stable enough to last longer to be used in devices. In effect, the there are some many colors of light emitting devices but the most important colors are red, green and blue. These are called pixels and several of these are used to make light systems.
Types of LEDs and theirs characteristics |
Moreover, these compounds should have certain desirable qualities or properties and this depends on the nature of light emitting device. For instance ,these qualities include high melting point and amorphous or smooth texture.
There are two main groups of there light emitting chemical compounds used in LEDs. They are inorganic compounds and organic compounds. Light emitting diodes containing inorganic compounds are simply called LEDs. However, those containing organic compounds are called OLEDs . Apart from these , the compounds can be divided into those that are made of entirely small molecules and large those that are made of very large molecules that are called polymers. These compounds are used in different devices because of their nature .
Examples of inorganic LEDs are used in point light sources such as light bulbs. Other uses of LEDs is in constantly producing light such as traffic light bulbs and backlights of certain LCD devices. This is usually called LED television. This is not the same as OLED television because the OLED screen is the actual light emitting compound and not LCD.
Organic Light Emitting Diodes
Carbon (organic) compounds are very useful in making Organic light emitting diodes (OLEDs) and this is due to the unique properties of organic molecules. For instance , organic molecules can be made to form very flat and light sheet and smooth texture materials . As a result, they are very desirable in making flat screen light emitting electronic devices. For instance, OLED televisions on the market do not require any backlighting and they work much faster. Apart from this, OLEDs are flexible and light and therefore easier to handle. There are several other OLED applications and this includes cell phones, computers and laptops and lighting systems at home. More sophisticated applications are still underway. Some OLED electronics currently on the market are shown in this link. Click here.
In conclusion, light emission electronics industry have improved due to compounds that undergo electroluminescence. It is therefore worthwhile to seek these chemical compounds as a means to improve lives of people and make things easier. The link that is shown here contains a simple video of some devices that contain OLEDs. Click the link here. There are also reference articles and materials that one can read to get better understanding.
The video attached shows how light emitting devices work This also includes the chemistry as well as the electronics and why they are so important. Click here to see a video of the details . OLEDs are new and more expensive to make so they more expensive than LEDs. However more research is done to lower the cost and make it cheaper to buy and this will make it more popular.
