A study of preparation and optical properties of the white OLEDs stacked with YAG and Sr2Si5N8:Eu phosphors based color conversion layers

Hybrid organic-inorganic white light emitting devices were fabricated by the phosphor cerium-doped yttrium aluminum garnet (YAG) and nitridosilicate Sr₂Si₅N₈: Eu (258) with blue OLEDs, which emit electroluminescence spectrum with a dominant peak at 470 nm. The phosphors with different concentration were doped become color conversion layers (CCL), which could absorb blue light effectively for red and yellow, and finally mixes the unabsorbed blue emission to produce white light emission. When the concentration of YAG and 258 phosphors were fixed at concentration of 10wt% and 6wt%, respectively, with 30μm thickness of CCL and current density of 10 mA/cm², the CIE and the luminous efficiency were (0.28,0.43) and 13.1 cd / A, respectively. All the results indicated that the hybrid organic-inorganic is a feasible approach to obtain white light emitting devices.