Multicolour light emitting diode lamp for use in plant cultivation, lighting device and plant cultivation method

Abstract

In the field of LED lighting for use in plant cultivation, the dominant light source is a colour blend of red and blue light. However, because the luminescence intensity of red is weaker than that of blue, at present, the colour is adjusted by means of the number of lamps used. Thus, a small number of blue LEDs are interspersed among a large number of red LEDs, and the inability to make the blue illumination uniform presents a problem. Disclosed is a multicolour light emitting diode lamp wherein a blue LED and a balancing AlGaInP red LED, having a high light emission efficiency, are built-into the same package. The in-built red LED comprises a light emitting section containing a light emitting layer formed from the composition formula: (AlXGa1-X)YIn1-YP(0<=X<=1, 0<Y<=1). When a uniform current is applied, the red LED emits at least as many photons as the blue LED. In adapting the device for plant cultivation when a strong red light is desirable, the desired colour blend can be obtained with one lamp and it is possible to make the illumination of the light uniform, by installing two red LEDs and one blue LED in the device.

Description

technical field [0001] The invention relates to a multicolor LED lamp for plant cultivation, an illuminating device and a plant cultivation method. [0002] This application claims priority based on Patent Application No. 2009-184569 for which it applied to Japan on August 7, 2009, The content is used for this application. Background technique [0003] In recent years, plant cultivation using artificial light sources has been studied. In particular, cultivation methods using light-emitting diodes (abbreviation: LEDs), which are excellent in monochromaticity and capable of energy saving, long life, and miniaturization, have attracted attention. [0004] According to the research results so far, the effects of blue light with a wavelength of around 450nm and red light with a wavelength of 600 to 700nm have been confirmed as light emission wavelengths suitable for plant cultivation (photosynthesis). In particular, red light with a wavelength near 660-670nm for photosynthesis ...

AI Technical Summary

Problems solved by technology

However, LEDs with the above-mentioned light-emitting layer have Ga 0.5 In 0.5 The wavelength of the light-emitting layer composed of P is the longest, and the peak wavelength is around 650nm. In the wavelength region longer than 655nm, it is difficult to realize practical use and high output power.

Therefore, there is a problem that the LED provided with the above-mentioned light-emitting layer is not suitable for use as a light source for plant cultivation.

Images