Patent ID: 7492094

Claim:
A display based on a photoluminescence quenching device (PQD), the display comprising: a substrate; an emitter layer; a first electrode layer, which is transparent and is arranged on a front side of the emitter layer; a second electrode layer, which is disposed on the backside of the emitter layer; and an electron barrier layer comprising phenylenediamine derivatives and a hole barrier layer where the hole barrier layer and the electron barrier layer are respectively disposed between the emitter layer and one of the first electrode layer and second electrode layer, wherein a highest occupied molecule orbital of the hole barrier layer is energetically lower than a highest occupied molecule orbital of the emitter layer and a lowest unoccupied molecule orbital of the electron barrier layer is energetically higher than a lowest unoccupied molecule orbital of the emitter layer, wherein the lowest unoccupied molecule orbital of the emitter layer corresponds to the lowest unoccupied molecule orbital of the hole barrier layer and the highest occupied molecule orbital of the electron baffler layer corresponds to the highest occupied molecule orbital of the emitter layer, whereby the first electrode layer forms a cathode and the second electrode layer forms an anode during re-emissive operation of the display, and the first electrode layer forms the anode and the second electrode layer forms a cathode during emissive operation of the display; and wherein the hole barrier layer comprises at least one compound selected from a group consisting of oxadiazole derivatives, oxazole derivatives, triazole derivatives and quinoxaline derivatives and/or at least one compound selected from a group consisting of naphthalene carboxylic acid imide derivatives, naphthalene dicarboxylic acid diimide derivatives and wide-bandgap inorganic semiconductors.