Light-emitting polymer composition and organic EL display device using the same

1. A donor substrate for Laser Induced Thermal Imaging (LITI) method, comprising:

a base substrate;

a light-to-heat conversion layer formed on the base substrate; and

a transferring layer formed on the light-to-heat conversion layer,

wherein, the transferring layer comprises:

first and second light-emitting polymers having chemical elements forming a light-emitting polymer composition, and

an additive which improves adhesion of the light-emitting composition to the base substrate and lowers the cohesion between the chemical elements of the first and second light-emitting polymers,

wherein the first and second light-emitting polymers have different interfacial characteristics which lower a cohesion between the chemical elements of the first and second light-emitting polymers, and

wherein a corresponding wavelength spectrum of the first light-emitting polymer overlaps a corresponding wavelength spectrum of the second light-emitting polymer in a wavelength range between 500 nm and 700 nm, so as to allow an energy transfer in the light-emitting polymer composition, and

wherein the first light-emitting polymer has a mixing mass ratio in a range between 0.3 and 0.8, the second light-emitting polymer has a mixing mass ratio in a range between 0.2 and 0.7, and the additive has a mixing mass ratio of less than 0.7.

2. The donor substrate of claim 1 , wherein the additive is one of an optically inert polymer, an optically inert low-molecular material, a polymer having a carrier transporting ability, and a low-molecular material having a carrier transporting ability.

3. The donor substrate of claim 2 , wherein the optically inert polymer is selected from a group consisting of a polystyrene, a poly(styrene-butadione) copolymer, a polymethylmethacrylate, a polyalphamethylstyrene, a styrene-methylmethacrylate copolymer, a polybutadiene, a polycarbonate, a polyethylene terephthalate, a polyester sulfonate, a polysulfonate, a polyarylate, a fluorine polyimide, a transparent fluoric resin, and a transparent acrylic resin.

4. The donor substrate of claim 2 , wherein the polymer having the carrier transporting ability is selected from a group consisting of an arylamine based polymer, a perylene group based polymer and a pyrrole-based polymer.

5. The donor substrate of claim 2 , wherein the low-molecular material having the carrier transporting ability is one of an arylamine, a hydrazone, a carbazole, a stilbene, a starburst group, and an oxadiazole.

6. A donor substrate for Laser Induced Thermal Imaging (LITI) method, comprising:

a base substrate;

a light-to-heat conversion layer on the base substrate; and

a transferring layer on the light-to-heat conversion layer,

wherein the transferring layer comprises

a light-emitting polymer composition having first and second light-emitting polymers; and

an additive which improves adhesion of the light-emitting polymer composition to the base substrate and lowers a cohesion between chemical elements of the light-emitting polymer composition, wherein the additive is one of an optically inert polymer, an optically inert low-molecular material, a polymer having a carrier transporting ability, and a low-molecular material having a carrier transporting ability,

wherein the light-emitting polymer composition has a mixing mass ratio in a range between 0.333 and 0.675, and the additive has a mixing mass ratio in a range between 0.375 and 0.667, and

wherein a wavelength spectrum of the first light-emitting polymer overlaps a corresponding wavelength spectrum of the second light-emitting polymer in a wavelength range between 500 nm and 700 nm, so as to allow an energy transfer in the light-emitting polymer composition.

7. The donor substrate of claim 6 , wherein the optically inert polymer is selected from a group consisting of a polystyrene, a poly(styrene-butadione) copolymer, a polymethylmethacrylate, a polyalphamethylstyrene, a styrene-methylmethacrylate copolymer, a polybutadiene, a polycarbonate, a polyethylene terephthalate, a polyester sulfonate, a polysulfonate, a polyarylate, a fluorine polyimide, a transparent fluoric resin, and a transparent acrylic resin.

8. The donor substrate of claim 6 , wherein the polymer having the carrier transporting ability is selected from a group consisting of an arylamine based polymer, a perylene group based polymer and a pyrrole-based polymer.

9. The donor substrate of claim 6 , wherein the low-molecular material having the carrier transporting ability is one of an arylamine, a hydrazone, a carbazole, a stilbene, a starburst group, and an oxadiazole.

10. A donor substrate for Laser Induced Thermal Imaging (LITI) method, comprising:

a base substrate;

a light-to-heat conversion layer on the base substrate; and

a transferring layer on the light-to-heat conversion layer,

wherein the transferring layer comprises first and second light-emitting polymers forming a light-emitting composition which have different interfacial characteristics that lower a cohesion between elements of the light-emitting polymers, and wherein a wavelength spectrum of emitted light of one of the light-emitting polymers overlaps a wavelength spectrum of absorbed light of another one of the light-emitting polymers in a wavelength range between 500 nm and 700 nm, and

wherein the first light-emitting polymer has a mixing mass ratio in a range between 0.3 and 0.8, and the second light-emitting polymer has a mixing mass ratio in a range between 0.2 and 0.7.

11. The donor substrate of claim 10 , wherein the transferring layer further comprises an additive which improves adhesion of the light-emitting composition to the base substrate and lowers the cohesion between the elements of the light-emitting polymers.

12. A donor substrate for Laser Induced Thermal Imaging (LITI) method, comprising:

a base substrate;

a light-to-heat conversion layer formed on the base substrate; and

a light-emitting polymer composition formed on the light-to-heat conversion layer,

wherein, the light-emitting polymer composition comprises: a host polymer and a dopant polymer having chemical elements, and an additive, the host polymer having a mixing mass ratio in a range between 0.3 and 0.8, the dopant polymer having a mixing mass ratio in a range between 0.2 and 0.7, and the additive having a mixing mass ratio of less than 0.7,

wherein the host and dopant polymers have different interfacial characteristics which lower a cohesion between the chemical elements of the host and dopant polymers, and

wherein a corresponding wavelength spectrum of the host polymer overlaps a corresponding wavelength spectrum of the dopant polymer in a wavelength range between 500 nm and 700 nm, so that energy received by the host polymer is momentarily transferred to the dopant polymer.