Light emitting diode device incorporating a white light emitting layer in combination with a plurality of optical microcavities

A light-emitting diode device, comprising:

• a) a substrate;
• b) a reflective electrode and a semi-transparent electrode formed over the substrate and an unpatterned white light-emitting layer formed between the reflective electrode and the semi-transparent electrode, the reflective electrode, semi-transparent electrode, and unpatterned white-light-emitting layer forming an optical microcavity, and wherein either the reflective or semi-transparent electrode is patterned to form a plurality of independently controllable light-emitting elements;
• c) a plurality of color filters formed over a side of the semi-transparent electrodes opposite the unpatterned white light-emitting-layer in correspondence with the light-emitting elements, the plurality of color filters having at least two different colors and wherein at least one light-emitting element has no color filter;
• d) wherein the light-emitting element having no color filter includes a plurality of optical microcavities tuned to emit complementary colors of light, each optical microcavity tuned to emit light at a different wavelength.

A light-emitting diode device, comprising:

• a) a substrate;
• b) a reflective electrode and a semi-transparent electrode formed over the substrate and an unpatterned white light-emitting layer formed between the reflective electrode and the semi-transparent electrode, the reflective electrode, semi-transparent electrode, and unpatterned white-light-emitting layer forming an optical microcavity, and wherein either the reflective or semi-transparent electrode is patterned to form a plurality of independently controllable light-emitting elements;
• c) a plurality of color filters formed over a side of the semi-transparent electrodes opposite the unpatterned white light-emitting-layer in correspondence with the light-emitting elements, the plurality of color filters having at least two different colors and wherein at least one light-emitting element has no color filter;
• d) wherein the light-emitting element having no color filter includes a plurality of optical microcavities, each optical microcavity tuned to emit light at a different wavelength;
• and
• e) wherein the white light-emitting layer comprises inorganic quantum dots formed in a poly-crystalline semiconductor matrix.

A method of making an LED device, comprising the steps of:

• a) providing a substrate;
• b) forming a reflective electrode and a semi-transparent electrode over the substrate and forming an unpatterned white light-emitting layer between the reflective electrode and the semi-transparent electrode, the reflective electrode, semi-transparent electrode, and unpatterned white-light-emitting layer forming an optical microcavity, and wherein either the reflective or semi-transparent electrode is patterned to form a plurality of independently controllable light-emitting elements;
• c) forming a plurality of color filters over a side of the semi-transparent electrodes opposite the unpatterned white light-emitting-layer in correspondence with the light-emitting elements, the plurality of color filters having at least two different colors and wherein at least one light-emitting element has no color filter;
• and
• d) wherein the optical microcavity of one or more of the light-emitting elements that have no color filter comprises a plurality of optical microcavities tuned to one or more peak wavelengths approximately corresponding to the peak emission wavelengths of the white-light-emitting layer, each optical microcavity tuned to emit light at a different wavelength.