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

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.