살균용 UV-C발광 Y2Si2O7:Pr3+ 박막형광체의 Up-conversion 특성

Abstract

The film was spin-coated on the quartz substrate with Y-Si-Pr stoichiometric-contained solution, and then annealed at high temperature around 1300 ℃ in a air atmosphere. The obtained film showed the triclinic structure of Y2Si2O7:Pr3+ phosphor. It showed the broad Pr3+-based f-d transitional down-conversion spectrum with a main peaks at 267 nm by a high-energy excitation of 220 nm. Some surface cracks was minimized by controlling acid concentration of the solution, and the optimized film showed the crack-free surface morphology and the thickness of about 600 nm. The phosphor film showed strong UV-C emission with a main peak of 267 nm by a lower-energy light in the blue region, which is coincident with the germicidal action curve. Finally, the sterilization of microalgae was demonstrated by the UV-C Up-conversion phosphor under an excitation of 464 nm blue LEDs, and thus their population are linearly decreased with time elapse.