Organic light-emitting device with electron blocking layer and trapping layer and organic light-emitting display using the same

An organic light-emitting display, comprising:

• a substrate comprising a plurality of subpixels;
• a thin-film transistor in each subpixel over the substrate;
• and
• an organic light-emitting element at each sub-pixel, the organic light-emitting element comprising:
• an anode;
• a hole transport layer over the anode;
• an electron blocking layer over the hole transport layer;
• an organic emitting layer contacting the electron blocking layer;
• an electron transport layer contacting the organic emitting layer;
• a cathode over the electron transport layer;
• and
• a trapping layer between the hole transport layer and the electron blocking layer,
• wherein each thin-film transistor is connected to one of:
• the anode and the cathode, and
• wherein a LUMO energy level of the trapping layer differs from a HOMO energy level of the electron blocking layer within a range of 1 eV,
• wherein the LUMO energy level of the trapping layer differs from a HOMO energy level of the hole transport layer within a range of 1 eV, and
• wherein the LUMO energy level of the trapping layer is between the HOMO energy level of the hole transport layer and the electron blocking layer.