Radiation-Emitting Organic-Electronic Device and Method for Producing a Radiation-Emitting Organic-Electronic Device

A radiation-emitting organic electronic device comprising:

• a substrate;
• a first electrode disposed over the substrate;
• and
• a light-emitting layer disposed over the first electrode, wherein the light-emitting layer comprises a fluorescent compound of the following formula A:
• where
• R is an electron-withdrawing substituent,
• R′ is an electron-donating substituent,
• the spacer comprises a linear molecular chain with the substituents R and R′ bonded to ends and at least one E group bonded to the linear molecular chain, where E is hydrogen and/or an organic radical, and
• the linear molecular chain of molecules of the fluorescent compound is aligned parallel to the plane of extension of the substrate;
• and
• a second electrode disposed over the light-emitting layer.

A process for producing a radiation-emitting organic electronic device, the process comprising:

• A) providing a substrate;
• B) applying a first electrode to the substrate;
• C) applying a fluorescent compound of the following formula A to the first electrode for production of a light-emitting layer
• where
• R is an electron-withdrawing substituent,
• R′ is an electron-donating substituent,
• the spacer comprises a linear molecular chain with the two substituents R and R′ bonded to the ends and at least one E group bonded to the linear molecular chain, where E is hydrogen and/or an organic radical, and
• wherein the molecules of the fluorescent compound of the formula A have permanent dipole moments in the ground state,
• wherein the fluorescent compound is applied such that the permanent dipole moments are aligned parallel to the plane of extension of the substrate;
• and
• D) applying a second electrode to the light-emitting layer.

A radiation-emitting organic electronic device comprising:

• a substrate;
• a first electrode disposed over the substrate;
• a light-emitting layer disposed over the first electrode, wherein the light-emitting layer comprises a fluorescent compound of the following formula A:
• where
• R is selected from a group of electron-withdrawing substituents comprising
• and
• R′ is selected from a group of electron-donating substituents comprising
• where represent the bond of the substituents R and R′ to the spacer in the compound of the formula A,
• where R″=H, alkyl, OH, Oalkyl, SH, Salkyl or Hal,
• alkyl=CH3, C2H5, CH(CH3)2 or CH2CH2CH3 and
• Hal=F, Cl, Br or I,
• the spacer comprises a linear molecular chain with the two substituents R and R′ bonded to the ends and at least one E group bonded to the linear molecular chain, where E is hydrogen and/or an organic radical, and
• wherein the linear molecular chain of the molecules of the fluorescent compound is aligned parallel to the plane of extension of the substrate;
• and
• a second electrode disposed over the light-emitting layer, wherein in the operation of the device, the molecules of the fluorescent compound may each have a singlet ground state S0, an excited singlet state S1 populated by a singlet exciton and a triplet state T1 excited by triplet excitons, and the transition of the singlet exciton from the S1 to the singlet ground state S0 can result in emission of radiation, wherein the transition dipole moment of the transition of the singlet exciton from the S1 state to the S0 ground state in the molecules of the fluorescent compound in the light-emitting layer is aligned parallel to the plane of extension of the substrate.