Progress of OLED Lighting Technology Overview
The 21st century to organic light-emitting diode (OLED) technology-based next-generation display and lighting industry and the industrial chain in Europe and the United States, Japan, Korea and China and other countries are rapidly developing. OLED is an organic light-emitting diode (OrganicLightEmittingDiode, OLED) abbreviation. OLED and LED light-emitting principle similar. OLED is the use of organic semiconductor material properties, driven by an electric field to electrons and holes in the light-emitting layer composite form excitons, which come down from the excited state to the ground state, while the release of energy in the form of light waves. Different materials have different emission wavelengths. OLED Technology Organic light-emitting material according to the different can be divided into small molecule OLED and polymer OLED.
In the field of flat panel display, OLED has the chemical DC drive, self-luminous, high brightness, high efficiency, wide angle, low power consumption, ultra-thin, can be a large area display, LED full color, low cost, long life, low temperature, work temperature range and other advantages, the industry as is the second liquid crystal display (LCD), plasma display (PDP) after the next-generation flat panel display products and technologies.
With technological advances in OLED, OLED lighting will also benefit from the development stage into the commercial application stage, characterized by surface light-emitting OLED lighting and other lighting show compared to the energy efficiency, environmental protection, the potential advantages of high efficiency, long life, low-cost white OLED lighting products are the focus of development.
1, OLED's basic structure and principles of light
OLED can be divided into two main types of small molecule and polymer type, its structure is different.
Both small molecule OLED, or polymer OLED in thin transparent conductive properties of indium tin oxide (ITO film) between the cathode and metal anode layer has an organic light-emitting materials. Small molecule OLED light-emitting layer layered structure, that is, hole transport layer, emitting layer and electron transport layer composed of three layers, and polymer OLED organic light-emitting layer of single-layer structure.
OLED in the role of external electrodes, its cathode and anode produced by electron holes produced were injected into organic light-emitting layer, the emitting layer, electrons and holes meet the complex form excitons, exciton-photon attenuation issued resulting in visible light. Radiation of light through transparent glass or plastic substrate from the anode side of the observation. Light-emitting materials and components are different colors of light emitted is different. By selecting different organic light-emitting materials, can be red, green, blue, color of achieving. The red, green and blue fluorescent material or phosphorescent material mixed into a RGB device can produce white light.
Small molecule OLED, the electron and hole were first injected into the electron transport layer and hole transport layer, and then injected into the emitting layer, in the light-emitting layer electron and hole meet the complex, as the band's transition and send visible light, can be seen, OLED and LED light-emitting light-emitting principle is basically the same principle, only materials and structures are different.
Second, OLED lighting application and development of the field
With the OLED technology continues to improve, OLED lighting will be entered in the commercial application. OLED lighting has a surface light, high brightness, large area, scattering light, ultra-light, ultra-thin, flexible, transparent, mirror-based, new lighting design, etc., compared with other lighting products, OLED shows energy saving, high efficiency, potential advantages such as low-cost, solid state lighting is after the next-generation LED solid state lighting.
OLED lighting the LCD backlight, office, home, automobile, aircraft interior lighting and targeted lighting, signage lighting, interior, lighting and other functional aspects of performance will be widely used.
OLED thin, flexible combination of surface light-emitting characteristics of the substrate flexibility and scalability characteristics of room lighting to give the future a new design. Will no longer be confined to a single room lighting lamps, lighting, lighting fixtures can be achieved without a sense of the overall lighting effect. As the OLED light source is different from the traditional lighting of the new features that will drive and develop new OLED lighting design, lighting engineering, lighting and other relevant areas of innovation and development.
OLED lighting is energy saving, environmental protection, etc., with the growing emphasis on environmental protection, the new pollution-free OLED backlight backlight as LCD traditional LCD backlight mainly cold cathode fluorescent lamp (CCFL), although the cold cathode fluorescent lamp has a very good features, but because of obviousness caused mercury pollution, and the color saturation is not enough. OLED pollution-free, high color gamut of advantages to the next generation of LCD backlight products of choice.
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