Luminescent ink for printing of organic luminescent devices

A method of fabricating an organic luminescent device comprising the steps of:

• obtaining a first electrode surface;
• printing a luminescent ink onto the first electrode surface to form a first thin film of luminescent material, wherein the luminescent ink comprises:
• a luminescent organic compound;
• an inert solvent;
• a functional additive in an amount sufficient to modify the viscosity of the luminescent ink to a viscosity in the range from about 5 to 1,000 cp, and/or modify the charge transporting ability of the luminescent ink to a balanced mode;
• and
• a cross-linking agent;
• initiating a cross-linking reaction in the luminescent ink;
• and
• coupling a second electrode to the printed film of luminescent material.

A photovoltaic solar cell fabricated by the method comprising the steps of:

• obtaining a first electrode surface;
• printing a luminescent ink onto the first electrode surface to form a first thin film of luminescent material, wherein the luminescent ink comprises:
• a luminescent organic compound;
• an inert solvent;
• and
• a functional additive in an amount sufficient to modify the viscosity of the luminescent ink to a viscosity in the range from about 5 to 1,000 cp, and/or modify the charge transporting ability of the luminescent ink to a balanced mode;
• and
• coupling a second electrode to the printed film of luminescent material.

A luminescent ink for printing of organic luminescent devices comprising:

• a luminescent organic compound selected from luminescent chromophores bound to a binding polymer and conjugated luminescent polymers;
• an inert solvent, wherein the solvent has a boiling point in the range from about 40° C. to about 200° C., and wherein the luminescent ink contains from about 50% to about 99.8% solvent, by weight;
• a functional additive having charge transporting, luminescent, or surfactant properties, said functional additive having a concentration in the luminescent ink in the range from 0.5 to 40 percent of the solid ingredients sufficient to modify the viscosity of the luminescent ink to a viscosity in the range from about 3 to 90,000 cp, and in an amount to modulate optical and charge transporting properties;
• and
• a cross-linking agent.

A luminescent ink for printing of organic luminescent devices comprising:

• a luminescent organic compound;
• an inert solvent;
• and
• a functional additive in an amount sufficient to modify the viscosity of the luminescent ink to a viscosity in the range from about 3 to 90,000 cp, and in an amount to modulate optical and charge transporting properties, wherein the functional additive comprises an organic luminescent molecule having a molecular weight less than 5000 g/mol and a concentration range between 0.5 to 40 percent of the solid ingredients.

A luminescent ink for printing of organic luminescent devices comprising:

• a luminescent organic compound;
• an inert solvent;
• and
• a functional additive in an amount sufficient to modify the viscosity of the luminescent ink to a viscosity in the range from about 3 to 90,000 cp, and in an amount to modulate optical and charge transporting properties, wherein the functional additive comprises an electron-transporting material.

A luminescent ink for printing of organic luminescent devices comprising:

• a luminescent organic compound;
• an inert solvent;
• and
• a functional additive in an amount sufficient to modify the viscosity of the luminescent ink to a viscosity in the range from about 3 to 90,000 cp, and in an amount to modulate optical and charge transporting properties, wherein the functional additive comprises a dopant that promotes excited energy state transfer.