Comprehensive review of traditional and solid light sources

Keywords: traditional light source, solid light source, thermal radiation source, gas discharge source, LED source, OLED source

I. Introduction

As the core of the lighting technology, electric light source technology has developed rapidly. Today's advanced traditional energy-saving light source is still strong, and the novel solid-state light source LED and OLED peaks have been recognized as the hope of the 21st century lighting revolution. From the development history of electric light source products for more than one hundred years, we can find that science and technology are the power of the first productivity law, and often there are valuable new light source products, all of which are discovered by new light-emitting principles, or breakthroughs in new materials and new processes. As a necessary basic condition. In 1989, incandescent lamps were born. In the following century, electric light sources ranged from Thermal Radiation Lamps to Gas Discharge Lamps to solid state lighting. The emergence of the craze has proved the correctness of this law. Writing this article, a comprehensive review of the development of modern light sources, is willing to analyze the performance comparison between traditional light sources and solid new light sources, which can benefit the development of new light sources and the development of production, and help China from the light source The major producing countries are over-powered by the light source technology and power. Of course, they hope to communicate and discuss with relevant people through this article, and get criticism and axe.

Second, the development and improvement of traditional light sources

(I) Improvement and improvement of heat radiation source

1. Fade out of incandescent lamps

Traditional incandescent lamps will gradually withdraw from the historical stage of artificial lighting because of their low luminous efficiency, which has become a consensus at home and abroad. However, recent studies have reported that incandescent filaments use special nanomaterials to bring their light effects close to fluorescent lamps. The glass bulbs use a new technology of electrostatic coating of diffused and transparent silica membranes. Improvements in helium or hydrogen, as well as coating with an infrared reflective layer or a special anti-Stokes phosphor layer, can convert the infrared radiation of an incandescent lamp into visible light, its light efficiency is significantly improved, and its light color is soft. Low price and easy to use, these will delay the incandescent lamp, especially the time when the low-power incandescent lamp exits the historical stage. According to the statistics of relevant UN agencies, the actual production of incandescent lamps in the world in the past two years has not risen and risen. This trend should attract our attention.

2. Development of tungsten halogen lamps

In 1959, people discovered the tungsten halogen cycle principle and produced a tungsten halogen lamp, which injected new vitality into the heat radiation source. The lamp has a small volume, the light maintenance rate is over 95%, and the light efficiency and life are obviously superior. Incandescent lamp. In recent years, tungsten halogen lamps that can be directly applied to the grid voltage of 220V or 110V have been produced, and their sizes can be as small as Ø14×54mm. They have excellent filament stability and shock resistance. The bulbs are transparent and frosted. Different specifications, the inner fuse is in accordance with IEC A32-2 standard, the lamp head is G9 type easy to connect, its main technical parameters are shown in Table 1. In recent years, a variety of new types of energy-saving halogen-tungsten lamps have been introduced. For example, JD-type and JDR-type novel tungsten-halogen lamps are made by coating TiO2/SiO2 infrared reflective layer technology (IRC) on quartz bulbs, through visible light transmission. The process of reflecting the infrared rays back to the filament makes the light efficiency of the lamp increase by 30%-45%, and the service life is 3000 hours. Since the tungsten halogen lamp has a particularly good color rendering property and is small in size and easy to decorate, it is still popular and widely used.

Table 1 Technical parameters of 220V tungsten halogen lamp