White light generation using CdSe/ZnS core-shell nanocrystals hybridized with InGaN/GaN light emitting diodes

We introduce white light generation using CdSe/ZnS core-shell nanocrystals of single, dual, triple and quadruple combinations hybridized with InGaN/GaN LEDs. Such hybridization of different nanocrystal combinations provides the ability to conveniently adjust white light parameters including the tristimulus coordinates (x, y), correlated colour temperature (T-c) and colour rending index (Ra). We present the design, growth, fabrication and characterization of our white hybrid nanocrystal-LEDs that incorporate combinations of (1) yellow nanocrystals (lambda(PL) = 580 nm) on a blue LED (lambda(EL) = 440 nm) with (x, y) = (0.37, 0.25), T-c = 2692 K and R-a = 14.69; (2) cyan and red nanocrystals (lambda(PL) = 500 and 620 nm) on a blue LED (lambda(EL) = 440 nm) with (x, y) = (0.37, 0.28), T-c = 3246 K and R-a = 19.65; (3) green, yellow and red nanocrystals (lambda(PL) = 540, 580 and 620 nm) on a blue LED (lambda(EL) = 452 nm) with (x, y) = (0.30, 0.28), T-c = 7521 K and R-a = 40.95; and (4) cyan, green, yellow and red nanocrystals (lambda(PL) = 500, 540, 580 and 620 nm) on a blue LED (lambda(EL) = 452 nm) with (x, y) = (0.24, 0.33), T-c = 11 171 K and R-a = 71.07. These hybrid white light sources hold promise for future lighting and display applications with their highly adjustable properties.