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Oled
OLED (organic light-emitting diode) is a light-emitting diode made by placing a series of organic thin films between two conductors. When electrical current is applied, a bright light is emitted from a device that is 100 to 500 nm thick. There are different types of OLEDs including passive matrix OLEDs, active matrix OLEDs, and foldable OLEDs. OLEDs have advantages over traditional lighting like being lightweight, thin, flexible, more energy efficient, and having faster response times. However, their manufacturing processes are currently expensive and their organic materials have limited lifetimes. OLEDs are used in displays for phones, TVs, watches and can potentially replace traditional light bulbs
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Oled
- 1. OLED (OPTICAL LIGHT EMITTINGDIODE) SUBMITTED BY SOURABH KANT
- 2. HISTORY The first observationsof electroluminescence in organic materials were in the early 1950s in France. In 1960s, some scientists at New York university developed ac-driven electroluminescent cells using doped anthracene In 1977 they reported high conductivity similarly in oxidized and iodine- doped polyacetylene In 1987 Chin Tang and Van Slyke introduced the first light emitting diode from thin organic layers. Research into polymer electroluminescence culminated in 1990 in Cambridge reporting a high efficiency green light-emitting polymer based device using 100 nm thick films.
- 3. WHAT IS ANOLED ?? An organic light-emitting diode (OLED) is a light emitting diode made by placing a series of organic thin films between two conductors. When electrical current is applied, a bright light is emitted. A device that is 100 to 500 nm thick or about 200 times smaller than a human hair
- 4. The process canbe described as injection of electrons at the negative electrode and electron holes at the positive electrode. Current is applied across the organic material, such that one electrode negatively charged and the other positively charged. The process can be described as injection of electrons at the negative electrode and electron holes at the positive electrode. Electron holes and electrons meet and recombine in the emissive layer, the organic matter of the layer enters an excited (high- energy) state. As the layer returns to a low-energy state, it emits energy in the form of light.
- 5. TYPES OF OLED Passive-matrixOLED Active-matrix OLED Transparent OLED Top-emitting OLED Foldable OLED White OLED
- 6. PASSIVE MATRIX OLED PMOLEDs Have strips ofcathode, organic layer and strips of anode. They are easy to make but consume more power than other oleds. Best suitable for small screens.
- 7. ACTIVE MATRIX OLED AMOLEDs will be similarto passive but will have full layers of cathode, organic molecules, and anode; the anode layer will have a thin film transistor (TFT) back plate that forms a matrix. It consumes less power than Pmoleds.
- 8. FOLDABLE OLEDS Substrate made up of veryflexible metallic foils. Very light weight and durable. Use in devices can reduce breakage.
- 9. OLED Incandescent light bulbs Fluorescent lamps LED Illustration Principleof light emission Emits light by applying a voltage to organic matter Emits light by sending an electric current to a metallic filament Ultraviolet rays generated by an electric current collide with fluorescent material to produce visible light Emits light by applying a voltage to an inorganic semiconductor Characteristic ○Illuminates large area ○Energy efficient ○Slim ・Illuminates small area High power consumption High heat- ○Energy efficient Uses hazardous substance mercury lluminates small area ○Energy efficient ○Long life Comparison with existing forms of illumination
- 10. ADVANTAGES OF OLED OLEDSARE LIGHTWEIGHT AND THIN FLEXIBLE PLASTIC SUBSTRATE WIDER VIEWING ANGLE AND IMPROVED BRIGHTNESS CONSUME MUCH LESS POWER OLEDS HAVE MUCH FASTER RESPONSE TIME
- 11. DISADVANTAGES OF OLED Thebiggest technical problem for OLEDs was the limited lifetime of the organic materials. Manufacturing process are expensive right now. Water can easily damage oleds.
- 12. OLED APPLICATIONS Universal DisplayCorporation (UDC) is a leader in researching, developing and delivering OLED technologies. OLED technology is used in commercial applications such as displays and lightning. OLEDs have been used in most Motorola and Samsung color cell phones, as well as some HTC, LG and Sony Ericsson models. Nokia has also introduced some OLED products including the N85 and the N86 8MP, both of which feature an AMOLED display.
- 13. OLED displays wereused in watches made by Fossil (JR-9465) and Diesel (DZ-7086) Organic Light Emitting Diode televisions are the newest technology in the TV world. They deliver the best picture quality available today.
- 14. OLED lighting isthe future! Organic light-emitting diodes (OLEDs) are efficient light sources with new exciting features. Since almost 20% of the world’s electrical power consumption is due to lighting, there is a tremendous energy saving potential when efficient OLEDs are used instead of conventional light sources.
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