Preparation and luminescent properties of the coating of phosphor in lead-free glass by multilayer screen-printing

Abstract

The coating of phosphor in glass (PiG) for white light emitting diodes (WLEDs) has been prepared by multilayer screen-printing and low sintering-temperature. The lead-free and low-melting glass was synthesized, and the main compositions were P2O5-ZnO-B2O3 (PZB). The microstructure, luminescence spectra and lifetime behaviours of coating were investigated. The results of microstructure revealed that decreasing content of phosphor and increasing sintering temperatures were benefit for the coating because of better sintering. Based on the luminescence spectra, the suitable content of phosphor was 25% and sintering temperature was 600 °C. Under blue light (460 nm) exciting, the broad yellow band around 550 nm was obtained. It’s indicated that the white light can be achieved. The coating showed longer lifetime with increasing content of phosphor and lower sintering temperature. The obtained coating of PiG is expected to be an excellent material instead of organic resin for high-power WLEDs packaging.