Japanese technology leading June listed white LED samples

Nichia days ago developed the luminous efficiency of white light emitting diode 100lm/W (LED), in June 2006 began to supply samples (Figure 1). Plan in December of the same year put into mass production. From the luminous efficiency, the performance of more than the popularity of fluorescent lamps, and luminous efficiency can be higher varieties. 2005, the company had said before and after the mass production of 100lm/W products in. The announcement of the mass production time ahead of 3 to 4 years. Nichia will supply samples of white LED can get 6lm luminous flux in the input current of 20mA. Belonging to the input power is only 0.06W small power varieties. Specific prices will be agreed in the future.

Nichia chemical industries in academic conference published 113lm/W white LED product development. Due to the development of key technologies are being carried out smoothly, coupled with this year will be the 50 anniversary of the establishment of the company, and therefore decided to put into production 100lm/W products.

Figure 1: the right to use lighting effects for the white 100lm/W luminous efficiency reached LED. The use of 756, each luminous flux of 6lm white LED. The input power is 45W and the total luminous flux is 4536lm. Fluorescent lamp with a luminous efficiency of 58.5lm/W. Using 2 1170lm fluorescent lamps, the total luminous flux was 2340lm. Input power for 40W.

Figure 2: white LED development blueprint. Before and after 2007 to achieve the luminous efficiency of 150lm/W.

Nichia chemical industry also announced the 2007 future development blueprint. Allegedly, the development will be completed in 2007 150lm/W products (Figure 2) previously, other manufacturers have said that in 2006 to 2007 before and after the operation of 90lm/W ~ 100lm/W products, and Nichia chemical industries only released a conservative value.

"There is no technical breakthrough"

In order to achieve the luminous efficiency of 100lm/W, Nichia chemical industry improved shape and electrode structure of the blue LED chip white LED, with YAG yellow fluorescent material chip, and the 4 key technology of package shape. "These improvements have been steadily advancing long ago. The results can be said to be the epitome of previous work. The key technology in the specific aspects and not what breakthrough "(executive director of Nichia four house source city). For the luminous efficiency of 150lm/W, the estimation can be achieved by optimizing the key technology used to achieve this goal.

At the same time to improve the luminous efficiency, but also in the white light on the tone of a kung fu. The average color rendering index (Ra) of more than 80 was obtained by modifying the additive of YAG fluorescent material. Generally speaking, in the use of the blue LED chip white LED in order to improve the color rendering, usually by adding red or green fluorescent material, or will replace the yellow fluorescent material with green and red material technique. Nichia said: "in order to get more than 90 Ra white LED, fluorescent material must be changed fundamentally. However, Ra more than 90 of the general purpose of the use of art galleries and other lighting is very limited. The Ra is only 80 to reach the market size is very large. Therefore, through the class YAG fluorescent materials on the effort to meet the market requirements." (Mukai Takashi, director)

In the high input power of high power products of 1 digit, the luminous efficiency of 100lm/W products, Nichia has not disclosed in advance whether production. In 2005, the company has said it will supply around the year 2010 luminous efficiency of 100lm/W high power products. The company said that although it is now possible to achieve high power products in 100lm/W, but due to the high cost of production, it is too early to put into production.