US 8,552,639 B2 · White organic light emitting device

Abstract

A white organic light emitting device (WOLED) includes electroluminescence (EL) red and blue light emitting layers disposed inside a cavity and a non-electroluminescence (NEL) green light emitting unit disposed outside the cavity or on a region inside the cavity where there are no combinations of electrons and holes. The green light emitting unit adjusts a green spectrum by resonating greenish blue light in the cavity, or is disposed on a path through which red and blue light output from the cavity travels and adapted to absorb the blue light and emit green light. A photoluminescence (PL) light emitting layer may be a capping layer covering the cavity. The capping layer functions as an optical path control layer controlling an optical path. A white spectrum is obtained by combining blue light and red light generated by EL and green generated by PL. This WOLED can operate at a low voltage.

Claims13

Dependent claims

A white organic light emitting device (WOLED), comprising:

first and second electrodes disposed spaced-apart from and opposite to each other;
an electroluminescence (EL) light emitting unit disposed between the first and second electrodes, the EL light emitting unit comprising a first light emitting layer and a second light emitting layer which emit light using combinations of electrons and holes;
and
a non-electroluminescence (NEL) light emitting unit disposed between the first and second electrodes, the NEL light emitting unit generating a third light having a wavelength different from those of light emitted by the first light emitting layer and the second light emitting layer by using light emitted by the EL light emitting unit,
with the first electrode and the second electrode defining an optical cavity in which the EL light emitting unit is disposed, and with the NEL light emitting unit generating the third light by using a resonance structure between the first electrode and the second electrode.

2 more elements

Dependencies are inferred from the claim text.

White organic light emitting device

Life of this patent

White organic light emitting device

Life of this patent

Abstract

Claims13