Highly efficient and wide-color-gamut organic light-emitting devices using external microcavity

Highly efficient and wide-color-gamut organic light-emitting devices using external microcavity

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An external microcavity structure was introduced to the stacked cathode in organic light-emitting devices (OLEDs), and its influence on the luminescent characteristics was investigated.From the detailed optical analysis that was conducted, it was found that the surface plasmon loss in a metal cathode can be reduced to about one-fifth by using a semi-transparent thin-film cathode, and can be extracted outside through the microcavity effect after being Cases converted to the thin-film waveguide mode.No less than 50% of the optical power in dipole emission was successfully utilized as the external and substrate modes.The luminous efficiency increased about 1.4-fold, and the color purity of the luminance also improved.

As a trial preparation of red, green, and blue OLEDs with the external microcavity structure, the color gamut improved greatly and approached the BT.2020 national 6 Piece Queen Storage Bedroom standard.The effect of the external microcavity will be discussed from the viewpoint of multi-scale optical analysis.