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 ( R a ). We present the design, growth, fabrication and characterization of our white hybrid nanocrystal-LEDs that incorporate combinations of (1) yellow nanocrystals (λ PL = 580 nm) on a blue LED (λ EL = 440 nm) with ( x , y ) = (0.37,0.25), T c = 2692 K and R a = 14.69; (2) cyan and red nanocrystals (λ PL = 500 and 620 nm) on a blue LED (λ 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 (λ PL = 540, 580 and 620 nm) on a blue LED (λ 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 (λ PL = 500, 540, 580 and 620 nm) on a blue LED (λ 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.