Highly efficient oled devices with very short decay times

An organic light-emitting device comprising

• an anode,
• a cathode, and
• an emitting layer between the anode and cathode, comprising
• 2 to 40% by weight of a triplet emitter X having a C1 symmetry,
• 0.05 to 5.0% by weight of a fluorescent emitter Y, and
• 55 to 97.95% by weight of a host compound(s),
• wherein the amount of the triplet emitter X, the fluorescent emitter Y and the host compound(s) does not exceed a total of 100% by weight, and
• wherein the singlet energy of the triplet emitter X (ES1(X)) is greater than the singlet energy of the fluorescent emitter Y (ES1(Y)).

An apparatus selected from the group consisting of stationary visual display units such as visual display units of computers, televisions, visual display units in printers, kitchen appliances and advertising panels, illuminations, information panels, and mobile visual display units such as visual display units in cellphones, laptops, digital cameras, MP3 players, vehicles and destination displays on buses and trains;

• illumination units;
• keyboards;
• items of clothing;
• furniture;
• wallpaper, comprising the organic light-emitting device comprising:
• an anode,
• a cathode, and
• an emitting layer between the anode and cathode, comprising
• 2 to 40% by weight of a triplet emitter X having a C1 symmetry,
• 0.05 to 5.0% by weight of a fluorescent emitter Y, and
• 55 to 97.95% by weight of a host compound(s),
• wherein the amount of the triplet emitter X, the fluorescent emitter Y and the host compound(s) does not exceed a total of 100% by weight, and
• wherein the singlet energy of the triplet emitter X (ES1(X)) is greater than the singlet energy of the fluorescent emitter Y (ES1(Y)).

A composition for an emitting layer, comprising

• 2 to 40% by weight of a triplet emitter X having a C1 symmetry,
• 0.05 to 5% by weight of a fluorescent emitter Y and
• 55 to 97.95% by weight of a host compound(s),
• wherein the amount of the triplet emitter X, the fluorescent emitter Y and the host compound(s) does not exceed a total of 100% by weight and the singlet energy of the triplet emitter X (ES1(X)) is greater than the singlet energy of the fluorescent emitter Y (ES1(Y)).