The application prospect of new type organic light-emitting diodes in China

The latest issue of the "Journal of Applied Physics" published a study from the Chinese scientists the latest research results, a manufacturing cost of scientists Changchun China Applied Chemistry Institute developed low and high luminous efficiency laminated type organic light emitting diode.

Organic light emitting diode (OLED) is a kind of thin film light-emitting diode (LED). The processing of these devices is much lower than the traditional LED, it can be used as a TV screen, computer display, portable system display, can also be used for lighting equipment, etc.. Compared with the traditional LCD display, one of the biggest benefits of OLED is that it does not require a backlight display, which means that it needs less current, with the same battery it can work longer, it can be widely used in small portable devices, most of these devices are using low resolution single color display, to to reduce power consumption.

Organic light-emitting diode (OLED) is considered as one of the most important flat panel display technologies in the future. It also has a great application prospect in the field of background light source and illumination. Through their own efforts, China's scientific research workers in the field has achieved impressive results.

Light emitting diode (LED) is a kind of semiconductor diode, which can convert electric energy into light energy, which has been widely used in daily life. Compared with incandescent lamp, the light emitting diode has the advantages of low working voltage and current, good impact resistance and long service life. However, light-emitting diodes are generally made of inorganic semiconductor materials such as gallium, arsenic, phosphorus, etc., the process is complex, high cost. In addition, the ordinary inorganic light-emitting diode as a point light source, it is difficult to apply to large areas and requires high resolution components, and can not be done very thin.

The research team leader Ma Dongge researcher Changchun of Applied Chemistry, Chinese Academy of Sciences, carbon based organic materials using similar plastics made of organic light emitting diode, its processing is relatively simple, low cost, and the organic light emitting diode is a surface light source with large area.

The experimental results show that, the organic light emitting diode light only single layer can achieve high efficiency, without the need for multiple complex light emitting layer; the unit organic light emitting diode series, can achieve higher efficiency. "Simple single layer, through the stacked structure to achieve high efficiency, 110 cd/A (current efficiency) efficiency should be a high efficiency of white light devices. "Ma Dongge said organic light emitting diode they developed in terms of cost, light mode and other advantages, has a good application prospect in the fields of lighting, display backlight.

It is reported that since 1987, the world's first efficient OLED in the United States after the successful launch of the development of the OLED industry and the world wide attention to the world of science and technology, began to develop rapidly in the world. "We OLED the study began in 1996, especially in recent years, we have done a lot of work in the field, developed a high efficiency and long service life of the red, green and blue OLED, white OLED has also developed a high efficiency, and is promoting its industrialization. "Ma Dongge said.

It is understood that, in consideration of the structure and process for the preparation of OLED, the driving circuit and the light emitting properties, it has many advantages: thin thickness, light weight, its core thickness of less than 1 mm, about LCD 1/3; all solid structure, good shock resistance, can adapt to the huge acceleration, vibration and other harsh environment; fast response, about a few microseconds to tens of microseconds, 1000 times faster than LCD, can display the image; less material consumption, simple preparation process (only need 86 procedures, general LCD needs 200 processes), cost at least 20% less than the LCD, easy to large scale production; low voltage DC drive (the minimum voltage of only 3 volts), low power consumption (power 2.4 inch polysilicon OLED module is 605 MW); without backlight, can be on different substrate materials can be made into soft curved display etc..

Many advantages determines its wide application prospect, at present, Japan, Britain, Germany, the United States and Holland and other countries have made great achievements in terms of OLED, but is still in the experimental stage, the market share is very low, this is mainly because there are still some problems to be solved on its technology. Such as poor stability, low life, color sequence assembly process is not mature, etc.. Although the world has not yet been born OLED products, but foreign products are expected to come out in 2010 and in 2011, we are also tracking the world's leading edge, accelerate the process of industrialization. "Ma Dongge said," white OLED to be applied to solve the efficiency, lifetime and cost problem now, in addition to reduce the material cost, simplify the structure of the main process should be to reduce the cost. In addition, the stack is the main component of OLED to achieve high efficiency and long life".

Insiders pointed out that the OLED industry has attracted the whole world, especially the "eyeball" attention, because OLED is the future potential flat-panel display products, with ultra-thin, energy saving and low cost, environmental protection and other hardware requirements. In addition, OLED products in the early stages of development, new applications to be developed, China has the opportunity to lead in the field of OLED. In addition, the country is to vigorously develop the flat panel display industry as a policy oriented, a large number of investment can support the development of the cause of OLED.

Ma Dongge China believes that the organic light emitting