The latest issue of the American Journal of Applied Physics published a new study from Chinese researchers—a stack of low-cost, high-efficiency stacks developed by scientists at the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences. Type organic light emitting diode.
An organic light emitting diode (OLED) is a thin film light emitting diode (LED) whose emission layer is an organic composite. The processing of these devices is much lower than traditional LEDs. It can be used as a display for TV screens, computer displays, portable systems, and for lighting equipment. One of the biggest benefits of OLED display over traditional LCD displays is that it does not require a backlight, which means it requires less current, and it can work longer with the same battery, making it widely available for small portable applications. Devices, most of which use a monochrome, low-resolution display to reduce power consumption.
Organic light-emitting diodes are considered to be one of the most important flat panel display technologies in the future. They also show great application prospects in the background light source and lighting fields, and become the hot research field today. Through their own efforts, Chinese researchers have achieved proud results in this field.
A light-emitting diode is a type of semiconductor diode that converts electrical energy into light energy and has been widely used in daily life. Compared with incandescent lamps, LEDs have the characteristics of good operating voltage and current, good impact resistance and long life. However, the light-emitting diodes are generally made of inorganic semiconductor materials such as gallium, arsenic, phosphorus, etc., and the process is complicated and the cost is high. In addition, ordinary inorganic light-emitting diodes are point light sources, which are difficult to apply to large-area components requiring high resolution, and it is impossible to make them very secure.
The research team led by researcher Ma Dongge of the Changchun Institute of Applied Chemistry of the Chinese Academy of Sciences has made organic light-emitting diodes using carbon-based organic materials similar to plastics. The processing is relatively simple and low-cost, and the organic light-emitting diode is a kind. A surface light source with a large light source area.
The experimental results also show that the organic light-emitting diode requires only a single light-emitting layer to achieve high efficiency without requiring multiple complex light-emitting layers; the unit organic light-emitting diodes are connected in series to achieve higher work efficiency. “Simple single-emitting layer, high efficiency through laminated structure, 110cd/A (current efficiency) efficiency should be the higher efficiency of current white light devices.†Ma Dongge said that they developed organic light-emitting diodes at cost and illumination. The advantages of mode and other aspects are obvious, and it has good application prospects in the fields of illumination and display backlight.
It is reported that since the world's first high-efficiency OLED was successfully launched in the United States in 1987, the development of OLED has attracted widespread attention from the world's industrial and scientific circles, and has begun to develop rapidly around the world. "We started OLED research in 1996, especially in recent years, we have done a lot of work in this field, developed high efficiency, long life red, green and blue OLED, and also developed high efficiency white OLED. And is promoting its industrialization." Ma Dongge said.
It is understood that from the aspects of OLED structure, preparation process, drive circuit and luminescence performance, it has many advantages: thickness 雹 light weight, its core thickness can be less than 1 mm, about 1/3 of LCD; all solid state structure It has good shock resistance and can adapt to harsh environments such as huge acceleration and vibration. Its response speed is about several microseconds to tens of microseconds, 1000 times faster than LCD, and it can display moving images. It has less material consumption and simple preparation process (generally only Need 86 processes, and LCD requires 200 processes), cost at least 20% lower than LCD, easy to mass production; low DC voltage drive (minimum voltage is only 3 volts), low power consumption (2.4 inch poly OLED module work) It consumes 605 microwatts; it can be made into a flexible display that can be bent on substrates of different materials without backlighting.
Many advantages have determined its broad application prospects. At present, Japan, the United Kingdom, Germany, the United States and the Netherlands have made great achievements in OLED, but they are still in the experimental stage, and the market share is very low. Because of its technical problems, there are still some problems to be solved.
Such as poor stability, low life, color maturity combination process is not mature. "Although there are no OLED products in the world, but foreign products are expected to come out in 2010 and 2011, we are also tracking the world's frontiers and accelerating the process of industrialization." Ma Dongge said, "White OLEDs should be applied, now Efficiency, life and cost issues must be addressed. In addition to material cost reduction, simplified structure should be the most important process to reduce costs. In addition, lamination is the most important device structure for achieving high efficiency and long life of OLED, with important application development. value".
The insiders pointed out that the OLED industry has attracted the attention of the whole world, especially the domestic "eyeball", firstly because OLED is a potential flat display product in the future, which meets the hardware requirements of ultra-energy saving, low cost and environmental protection. In addition, OLED products are in the early stage of development, and new application areas need to be developed. China has the opportunity to be at the leading level in the field of OLED. In addition, the state has made great efforts to develop the flat panel display industry as a policy orientation, and many investments can support the development of the OLED industry.
Ma Dongge believes that if China's organic light-emitting diode products want to reach the world's advanced level in terms of technology and quality, and achieve industrialization well, it is necessary to continue to improve the efficiency of devices under high brightness, develop new processes, and reduce costs. To meet the requirements of industrialization, improve the uniformity of large-area, continue to improve the stability of the device and solve the industrialization process and technical problems, and do a good job in market development.
Momentary Push Button Switch,Indicator Lamp,Ip67 Indicator Lamp,Indicator Light
Metal Switch-MU Series Co., Ltd. , http://www.nbswitch.com.cn