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Japanese experts discuss the latest technological advances LED

ampliar el tamaño de la fuente  disminuir el tamaño de la fuente fecha de publicación:2010-12-01   fuente:liang360   veces de vista:474

Energy and energy efficiency in the components and create the exhibition "Green Device 2010" at the same time the seminar "Green Device Forum 2010", and held a lighting led, OLED and other solid semiconductor laser light source technology seminar "next-generation lighting forum." The field of solid domestic and foreign firms from the light emitting efficiency, brightness, life, color, surface and point light source of the five points of the paper introduces the latest developments.

Philips lumens Japanese companies (Philips LumiledsLighting) Hiroyuki Kamiyama high efficiency white LED into the center of the relevant technology in the future were discussed. According to Kamiyama Hiroyuki introduced, according to ordinary white LED luminous efficiency rate, will be in the last few years, more than 200lm / W. Although the light bulb in the light-emitting efficiency and color LED inferior to the ordinary white LED, but it has now reached 90 ~ 100lm / W, would soon be more than 200lm / W. In the future, the high current density needed to achieve the same level of efficiency. Specific approach is to reduce the current density the higher the luminous efficiency but the lower the "recession (Droop)" phenomenon.

Philips lumens Japan to solve this issue, is changing and white LED bulbs LED light source color - blue LED chip structure. Although details were not disclosed, but has a blue LED chip emitting area in the quantum well layer and cut off near the interface layer, using electron or hole to prevent the accumulation of the layer structure, the combination of electrons and holes is easy again. This, 1mm square chip pass into the external quantum efficiency of up to 350mA current 65.5%, which leads to 1A current efficiency can be as high as 59%.

By the above method and to reduce the forward voltage technology, hope 1mm square chip in the current density 2A/mm2 luminous efficiency can be achieved when the 150lm / W, luminous flux can be achieved 1000lm. This requires that the internal quantum efficiency to 80% (currently 53%), external quantum efficiency increased to 72% (currently 47%), phosphor conversion efficiency to 252lm/Wopt (currently 228lm/Wopt).

Japan and Europe OSRAM Opto Semiconductors (OsramOpto Semiconductors GmbH) of MichaELSchmitt recession also introduced to reduce the high output power white LED technology. This is a project called "UX: 3" of the n internal electrodes in LED technology. Made the current evenly through the chip to control the current density and improve efficiency. In addition, the electrode surface by removing the chip, making it easier for chip to chip optical external release.

The company said the chip to the 1mm square pass into the current times the output power characteristics. With the current increases with the output power increased linearly ideal properties (not recession) than pass into the current 350mA ~ 1A range of optical output power characteristics than the ideal 15% lower.

Effectively shed the heat the chip, improve the reliability

Extend the life of the light source, the Toyoda Gosei Yamaguchi life husband delivered a speech. That used for lighting, high output power white LED, the light blue LED chip cooling method is very important. The company's products as used in cooling technology, first in ceramic substrate with high thermal conductivity will be a blue LED chip flip-chip package, the chip light-emitting layer of a heat source close to the ceramic substrate. Then, the LED chip electrode and the ceramic substrate of the electrode by gold tin (AuSn) solder connections. The presence of gold tin solder heat LED chips shed easily from the electrode. In the reliability test, even after twenty thousand hours of use, brightness is only about 5% lower. In the frequent white LED's turn on the lights, turn off the lights, the flow of the hot LED chip will be reduced, so that use could also be extended by life.

Toyoda Gosei has also introduced the company has developed a white package with glass LED. Glass package is characterized with the use of resin package reliability than ordinary white LED (short wavelength light does not become weak); linear expansion factor, since the LED chip and package substrate are very close and difficult to produce caused by the hot temperature. The development of the company and Sumita Optical Glass has cooperated. Currently, the program uses a small chip in some products, expand the technology, the latest data, access to 20mA current luminous efficiency of the 104.9lm / W (existing specifications for 76.5lm / W). First will be used for testing equipment and endoscopy and other special-purpose lighting, will also want to use a wider field of illumination.

LED lighting to become the protagonist, not only with high energy efficiency, sufficient brightness and longer life, etc., but also whether the pursuit of light, people feel comfortable. From this point forward the development of white LED is the Mitsubishi Chemical. In the "GreenDevice Forum 2010" on the off households Mitsubishi Chemical Fumio, said the performance of color and color tone of white light such as the future will become increasingly important.

Off households that only the average color rendering index (Ra) as a white LED color rendering to determine the value of good or bad is not enough. Because Ra does not contain a bright red color of high saturation color rendering evaluation. In this regard, stressed the company off households and the red phosphor CASN (CaAlSiN3; Eu2 +) to the white LED phosphor in the approach has the advantage.

Off households that want to further enhance the color, it would be near-ultraviolet LED on the combination of red, green and blue phosphors. Mitsubishi Chemical has developed the use of light near a wavelength of 405nm UV LED, white LED. Although there are still effect caused by reduced efficiency, due to the length of light waves caused by deterioration of packaging materials and other issues, but more than 95 Ra, high saturation of red color rendering (R9) more than 90. However, the luminous efficiency white LED color temperature of 2700K Shihai relatively low, only 25lm / W. The company will focus on the future light-emitting efficiency.

Off households in the speech referred to the 15 kinds of saturated colors as a color card color rendering of new Benchmarking Color QualityScale (CQS), Ra was low but the CQS high, but also can clearly see the object under lighting that is currently CQS accepted CIE TechnicalCommittee consideration.

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