White Light Generation with CdSe/ZnS Core-Shell Nanocrystals and InGaN/GaN Light Emitting Diodes

Abstract

We present hybrid white light sources that integrate CdSe/ZnS core-shell nanocrystals on blue InGaN/GaN light emitting diodes (LED). We report on the demonstrations of white light generation using yellow nanocrystals (lambda _PL =580 nm) hybridized on a blue LED (lambda _EL =440 nm) with tristimulus coordinates of x=0.37 and y=0.25, correlated color temperature of T _c =2692 K, and color rendering index of R _a =14.6; cyan and red nanocrystals (lambda _PL =500 nm and 620 nm) on a blue LED (lambda _EL =440 nm) with x=0.37, y=0.28, T _c =3246 K, and R _a =19.6; and green, yellow, and red nanocrystals (lambda _PL =540 nm, 580 nm, and 620 nm) on a blue LED (lambda _EL =452 nm) with x=0.30, y=0.28, T _c =7521 K, and R _a =40.9.