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(Color online) Schemes of the four general approaches to generate white light based on organic light-emitting devices.
Luminous efficiency as a function of brightness for the blue PHOLED and the white device. The inset shows the spectrum of the blue PHOLED.
Excitation and emission spectrum of the nitridosilicate phosphor used in the down-conversion layer.
(Color online) Normalized output spectrum of the white light-emitting down-conversion device. The spectrum was fitted according a simple down-conversion model, in order to calculate the expected efficiency of the device without consideration of light extraction enhancement. The picture shows the white light-emitting device.
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