A color tunable dual-wavelength light source structure for plant growth is disclosed. The color tunable dual-wavelength light source structure comprises a blue-emission device, a transparent substrate separable disposed on the blue-emission device, and a color conversion layer disposed on the transparent. The blue-emission device has a blue-light element and an encapsulation layer surrounding the blue-light element for emitting a blue light with the wavelength in the range of 430 nm to 460 nm. The color conversion layer converses part of the blue light into a red light with the wavelength in the range of 640 nm to 660 nm. The conversion layer and the blue-light element are disposed on the opposite sides of the encapsulation layer respectively. The ratio of the intensities of the red light and the blue light is positive correlation with the thickness of the color conversion layer.本發明係揭露一種可應用於植物生長之可調式雙波段光源結構,包含藍光發光裝置、透光基板以及色轉換層。其中,藍光發光裝置具有藍光元件及環繞藍光元件之封裝層,且藍光元件發射出波長介於430奈米至460奈米之間之藍光;透光基板可拆式設置於藍光發光裝置上;以及色轉換層位於透光基板上,且色轉換層與藍光元件各別位於封裝層相對之二側,色轉換層轉換部分之藍光至波長介於640奈米至660奈米之間之紅光。並且,前述之紅光與藍光之光強度比例正相關於色轉換層之厚度。100‧‧‧可調式雙波段光源結構110‧‧‧光源基板120‧‧‧藍光發光裝置121‧‧‧藍光元件122‧‧‧封裝層130‧‧‧透光基板140‧‧‧色轉換層141‧‧‧封裝元件142‧‧‧色轉換元件150‧‧‧導光裝置210‧‧‧厚度
