Light emitting materials are characterized by their fluorescence quantum yield. For light emitting devices like organic and inorganic LEDs the respective physical value is the external quantum efficiency, measured usually by electroluminescence (EL) method. For this application the External quantum efficiency measurement system C9920-12 system is designed.
The luminous efficiency of OLED devices depends on various factors such as absorption of the individual layers and of the glass substrate, reflectance of the surface, radiation angle and waveguiding capacity of the glass substrate. These effects are countered by using an integrating sphere as sample chamber.
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