CdS and CdSe Quantum Dot-Embedded Silicate Glasses for LED Color Converter.

Silicate glasses with CdS and CdSe quantum dots ( QDs) were synthesized for application as an inorganic color converter for a 450-nm blue light-emitting diode ( LED). CdO and ZnS (or ZnSe) were added, and heat treatment conditions were changed to control QD formation within the silicate matrix. Absorption spectra and high-resolution transmission electron microscopy confirmed the QD formation. Variations in absorption and photoluminescence ( PL) spectra were observed with CdSe QD-embedded glasses when heat treatment conditions varied, whereas glasses with CdS QDs did not show noticeable variation. QD-embedded glasses were then mounted on top of a 450-nm LED chip to make a color-converted LED, and their electroluminescence and PL spectra as well as CIE color coordinates were investigated. The practical potential of QD-embedded glasses as an inorganic color converter has been observed, and their spectral properties were discussed. [ABSTRACT FROM AUTHOR]