Currently, yellow phosphor of Y3Al5O12:Ce3+ (YAG:Ce) fluorescent material is applied to a 450~480nm blue LED light source to implement a white LED device and it has a simple structure, can obtain sufficient luminance, and is economical. However, in this method, in terms of spectrum analysis, it is difficult to mass-produce white LEDs having the same color coordinates due to color separation cause by the wide wavelength gap between blue and yellow band. There is a disadvantage that it is difficult to control optical properties such as color stability and color rendering. In addition, this method does not emit purple light in the range of 380 to 420nm, so it is white without purple color that can not implement the spectrum of the entire visible light spectrum as like sunlight. Because of this, it is difficult to implement a color rendering index(CRI) of 90 or higher, and natural light characteristics such as sunlight can not be expected. For this, need for a method of implementing sunlight with one LED by using a method of combining phosphors with one light source, rather than a method of combining red, blue, and yellow LEDs. Using this method, the characteristics of an artificial sunlight LED device with a spectrum similar to that of sunlight were demonstrated by implementing LED devices of various color temperatures with high color rendering by injecting phosphors into a 405nm deep blue LED light source. In order to find the spectrum closest to sunlight, different combinations of phosphors were repeatedly fabricated and tested. In addition, reliability and mass productivity were verified through temperature and humidity tests and ink penetration tests.

본 연구에서는 다양한 색상의 염료가 절화 장미 ‘Akito’ 품종의 염색에 미치는 효과를 알아보기 위해 시행되었다. 12가지 색상의 염료를 이용한 염색 결과, 다채로운 색상을 구현해 내고 관상 가치를 높일 수 있었지만 절화수명은 대조구보다 1-3일 단축되었다. 4종류의 blue 염색염료를 비교한 결과 Fantasy blue (Palace Chemical Co., Japan)와 Blue No.1(Vidhi Dyestuff Mfg LTD, India)의 색상이 좋았다. 고농도 (7.5g •L-1와 10.0g •L-1)의 blue 염색의 경우 잎의 착 색이 심하고 불균일 하였으며 꽃잎의 가장자리가 짙어 지는 현상이 나타났다.