ulv481x0p
Dołączył: 23 Lut 2011
Posty: 27
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Skąd: England
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 Wysłany: Pon 3:58, 14 Mar 2011 Temat postu: High-power LED-based infrared remote control light |
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To prepare the color temperature 2700-3500K, luminous flux greater than 82lm, while higher color rendering index Ra of 80, individuals that need to do the following: (1) accurate measurement of phosphor excitation and emission spectra, and to study the phosphor and chips emission spectrum of the matching; (2) control phosphor ratio, the low color temperature white LED with high color rendering to maintain a continuous spectrum; (3) choice of a good red phosphor, the luminous efficiency and attenuation control.
For high-power white LED spot, I personally think that the main improvement programs and the way the phosphor coating. The current way of phosphor coating are: conformal coating, spraying, evaporation, fluid dispensing, electrophoresis. 2008 Fifth China International Semiconductor Lighting Forum, Asymtek dispensing the company introduced the fluid (fluid dieing) of the phosphor coating method,[link widoczny dla zalogowanych], which can not only improve the consistency of high-power white LED can also improve the product of the spot results.
At present, many domestic manufacturers to adopt the only way the general dispensing, so there will be a yellow circle and other undesirable phenomena spot. In addition, some engineers use to make spot changes spread powder evenly.
Second problem: the color coordinates and the correlated color temperature conversion relationship between how? A: According to CIE chromaticity diagram, we know: It is known to calculate the correlated color temperature and color coordinates,[link widoczny dla zalogowanych], correlated color temperature can be calculated given isotherm.
The two issues raised by Mr. Liu is currently a lot of R & D staff is very concerned about packaging factory technical problems, as people on the human visual health awareness, high color rendering white LED product has large market demand,[link widoczny dla zalogowanych], and the low high color temperature white LED color rendering is a difficulty.
In this,[link widoczny dla zalogowanych], I reply as follows: high-low color temperature color scheme are: (1) The preparation of high-chip RGB trichromatic color white LED; (2) using InGaN blue LED excitation RGY phosphors were prepared by high color white LED; (3) using UV-LED excitation Preparation RGB color phosphor white LED. Since paragraph (1) program costs are relatively high (3) Technical and temporarily mature, so the market mainly in subsection (2) program. Cree, C adopt such programs.
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