| abstract |
A phosphor conversion light-emitting diode (LED) for plant cultivation comprises a semiconductor chip, generating short-wavelength (blue or near-UV) light due to injection electroluminescence, and a wavelength converter containing at least one phosphor, converting the said short-wavelength light to longer-wavelength light due to photoluminescence. The longer-wavelength light contains a far-red spectral component peaking in the spectral range of about 700 nm to 760 nm, corresponding to the absorption spectrum of plant photoreceptor phytochrome of the form P fr and thus meeting photomorphogenetic needs of plants. The far-red light can be generated by either partial or complete conversion of the short-wavelength light. The LED can emit other spectral components, such as blue and/or red light, which meets other photophysiological needs of plants. |