Cd-S-Se quantum dot embedded glasses with dual emissions for wide color gamut white LED

Abstract

Cd-S-Se quantum dot embedded glasses (QDEGs) with dual-band emissions of green and red were synthesized by assembling two QDEGs, to obtain a color converter for white LEDs (wLEDs) with a wide color gamut and long-term stability. Each QDEG, possessing different sizes of QD, was prepared by adjusting heat-treatment conditions. They were then bonded to each other by an additional heat treatment to fabricate a pattern structured QDEG (pQDEG). The fabrication conditions of the pQDEGs, such as their heat-treatment condition and thickness, were varied to improve the color gamut. pQDEG-based WLEDs were demonstrated and their optical properties such as color coordinates, luminous efficiency, and color rendering index (CRI) were monitored. The effect of pQDEG fabrication conditions on the resultant emission spectra and color gamut were discussed.