Udc Ireland Limited

Thomas Holcombe

Gerhard Wagenblast

Christian Lennartz

Korinna Dormann

Stefan Metz

Ute Heinemeyer

Minlu Zhang

The present invention relates to organic light-emitting devices comprising (a) an anode, (i) a cathode, and (e) an emitting layer between the anode and cathode, comprising 2 to 40% by weight of a triplet emitter X having a difference of the singlet energy (E(X)) and the triplet energy (E(X)) of less than or equal to 0.4 eV [Δ(E(X)) −(E(X))≤0.4 eV], 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) adds up to a total of 100% by weight and the singlet energy of the triplet emitter X(E(X)) is greater than the singlet energy of the fluorescent emitter Y(E(Y)) [(E(X))>E(Y)]. By doping, for example, an emitting layer containing a luminescent organometallic complex having a small S-Tsplitting, with a fluorescent emitter the emission decay time can significantly be shortened without sacrificing external quantum efficiency (EQE) because of very efficient energy transfer.

Highly efficient OLED devices with very short decay times

The present invention relates to organic light-emitting devices comprising (a) an anode, (i) a cathode, and (e) an emitting layer between the anode and cathode, comprising 2 to 40% by weight of a triplet emitter X having a difference of the singlet energy (E(X)) and the triplet energy (E(X)) of less than or equal to 0.4 eV [&#x394;(E(X))&#x2212;(E(X))&#x2264;0.4 eV], 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) adds up to a total of 100% by weight and the singlet energy of the triplet emitter X (E(X)) is greater than the singlet energy of the fluorescent emitter Y (E(Y)) [(E(X))&#x3e;E(Y)]. By doping, for example, an emitting layer containing a luminescent organometallic complex having a small S-Tsplitting, with a fluorescent emitter the emission decay time can significantly be shortened without sacrificing external quantum efficiency (EQE) because of very efficient energy transfer.

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Schifferstadt, Germany

Thomas Holcombe