Author: name the Yang, Chai Guosheng, Zhang Ming, high Guangyi Guangdong-Wright Optoelectronics Technology Co., Ltd.
Abstract: This paper introduces the development and current level of LED, discusses its application prospects in the field of lighting, existing problems and the key points to be improved, as well as the possibility and reality of automotive headlight lighting.
Keywords : solid state lighting, white LED, pn junction
I. Introduction
LED is a commonly known LED, and its Chinese name seems to have been abandoned. Almost everyone calls it LED. LEDs and their corresponding solid-state lighting (SSL) populations have been around for a long time. The blue, green and red LEDs have been used for large-screen color display and communication number indications for more than 20 years and have achieved great success. In the past 10 years, LED has achieved brilliant and almost monopolistic progress in car taillights and almost all other signal indications.
On the basis of the development of color LEDs, white LEDs have received great attention. SSL is developed on the basis of white LEDs. White LEDs have been hailed as new light sources in the 21st century.
In the development of LEDs, especially white LEDs, its theoretical or estimated luminous efficiency and exceptional life expectancy are fascinating, and the prospect of good energy-saving and environmentally-friendly lighting not only makes the experts eagerly pursue, but also attracts the attention of the government. and support. At present, the electricity consumption of lighting in developed countries accounts for about 13-14% of the total power generation. The energy consumption and greenhouse gas emissions and other pollution generated by the developed countries are extremely considerable. If there is progress in green lighting, The platoon will have a huge effect.
In the early days of the mid-1990s, when the white LEDs came to the forefront, the Japanese government took the lead in funding research and industry to develop white LEDs and lighting. They were extremely sensitive, sensible and decisive because of the development of Japan’s small folks and poor resources. . Even the United States, whose GDP and resource consumption are the highest in the world, has followed government actions and given strong policy and financial support to SSL. This shows that the current huge energy consumption and environmental expenditures have made such a rich US Unbearable. Subsequently, European and American countries and China have been alert and given SSL to support, including financial support.