organic light-emitting diodes

organic light-emitting diodes are an innovative technology developed by Ching Tang and Steven Van Slyke at Eastman Kodak, with the first OLED display created in 1987 at Eastman Kodak's research facilities. The development of OLEDs involved the collaboration of numerous researchers, including Karlheinz Beyer and Wolfgang Helfrich, who worked at RCA Laboratories. This technology has been further advanced by companies such as Samsung Electronics, LG Electronics, and Sony Corporation, which have developed various applications, including television sets and smartphones, in collaboration with research institutions like Stanford University and Massachusetts Institute of Technology.

Introduction

The discovery of electroluminescence by Henri Becquerel in 1887 laid the foundation for the development of OLEDs, which was later influenced by the work of Oleg Losev and Nikolay Zheludev. Researchers at Bell Labs and IBM also contributed to the advancement of OLED technology, with scientists like Nick Holonyak and M. George Craford making significant contributions. The use of OLEDs in displays has been explored by companies like Apple Inc., Google, and Microsoft, which have developed products such as the iPhone and Xbox, in partnership with manufacturers like Sharp Corporation and Toshiba Corporation. Furthermore, organizations like the Society for Information Display and the Institute of Electrical and Electronics Engineers have played a crucial role in promoting the development and standardization of OLED technology.

Principles_of_Operation

The operation of OLEDs is based on the principle of electroluminescence, where an electric current excites the organic compounds, causing them to emit light, a phenomenon also observed in light-emitting diodes developed by Nick Holonyak at General Electric. This process involves the use of anodes and cathodes, typically made of materials like indium tin oxide and aluminum, which are also used in solar cells developed by Sharp Corporation and SunPower Corporation. The emission of light is influenced by the properties of the organic materials, such as their bandgap and mobility, which are also relevant to the development of transistors by researchers at Intel Corporation and Texas Instruments. Companies like Universal Display Corporation and Merck KGaA have developed materials and technologies that enhance the efficiency and lifespan of OLEDs, in collaboration with research institutions like Harvard University and University of California, Berkeley.

Types_of_OLEDs

There are several types of OLEDs, including passive-matrix OLEDs and active-matrix OLEDs, which have been developed by companies like Samsung Electronics and LG Electronics. Other types of OLEDs include transparent OLEDs and flexible OLEDs, which have been explored by researchers at Stanford University and Massachusetts Institute of Technology. The development of white OLEDs has also been pursued by companies like Osram Licht AG and Philips Lighting, which have developed various lighting products, including LED lamps and laser lighting. Additionally, organizations like the European Union's Horizon 2020 program and the United States Department of Energy have supported research and development of OLED technology, in partnership with companies like BMW and Volkswagen.

Materials_and_Manufacturing

The materials used in OLEDs include organic compounds like polyfluorene and polyphenylene vinylene, which have been developed by researchers at University of Cambridge and University of Oxford. The manufacturing process typically involves the use of vacuum deposition and screen printing, techniques also used in the production of solar cells by companies like First Solar and SunPower Corporation. Companies like Merck KGaA and BASF have developed materials and technologies that enhance the efficiency and lifespan of OLEDs, in collaboration with research institutions like California Institute of Technology and Carnegie Mellon University. Furthermore, organizations like the National Institute of Standards and Technology and the International Electrotechnical Commission have established standards for the development and testing of OLED materials and devices.

Applications

OLEDs have a wide range of applications, including display devices like television sets and smartphones, developed by companies like Samsung Electronics and Apple Inc.. They are also used in lighting applications, such as OLED lamps and OLED lighting panels, developed by companies like Osram Licht AG and Philips Lighting. Additionally, OLEDs are used in automotive displays and wearable devices, such as smartwatches and fitness trackers, developed by companies like LG Electronics and Fitbit. Researchers at Stanford University and Massachusetts Institute of Technology have also explored the use of OLEDs in biomedical applications, including biosensors and implantable devices, in collaboration with companies like Medtronic and Boston Scientific.

History_and_Development

The development of OLEDs began in the 1960s with the discovery of electroluminescence in organic materials by researchers like Martin Pope and Hans Kopfermann. The first OLED display was created in 1987 by Ching Tang and Steven Van Slyke at Eastman Kodak, using materials developed by companies like DuPont and Hoechst AG. Since then, OLED technology has advanced rapidly, with the development of new materials and manufacturing techniques by companies like Samsung Electronics and LG Electronics. Researchers at University of California, Los Angeles and University of Illinois at Urbana-Champaign have also made significant contributions to the development of OLED technology, in collaboration with organizations like the National Science Foundation and the Defense Advanced Research Projects Agency. Today, OLEDs are used in a wide range of applications, from consumer electronics to automotive displays and lighting, with companies like Sony Corporation and Panasonic Corporation continuing to develop and improve OLED technology.