White oled devices with color filter arrays

• US 20050147844A1
• Filed: 01/05/2004
• Published: 07/07/2005
• Est. Priority Date: 01/05/2004
• Status: Abandoned Application

• Current Assignee: Eastman Kodak Company
• Original Assignee: Eastman Kodak Company
• Inventors: Spindler, Jeffrey P., Hatwar, Tukaram K., Brown, Christopher T., Ricks, Michele L.
• Application Number:
  US10/751,352
• Publication Number:
  US 20050147844A1
• Time in Patent Office: Days
• US Class Current: 428/690
• CPC Class Codes: H10K 50/125 specially adapted for multicolour light emission, e.g. for emitting white light
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/17 Passive-matrix OLED displays
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 85/322 comprising boron
• CPC Class Codes: H10K 85/622 containing four rings, e.g. pyrene
• CPC Class Codes: H10K 85/624 containing six or more rings
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine

Abstract

An OLED device produces white light more effectively matching the response of multicolor filters in an OLED device including an anode and a cathode and an organic EL element disposed between the anode and cathode having at least two different dopants for collectively emitting white light. The device includes a color filter array disposed over the EL element and including at least three separate filters having bandpass spectra for passing red, green, and blue light, respectively, in response to white light to produce preselected color outputs, and the composition of one or more of the dopants being selected to change the spectrum of the white light to be compatible with the spectrum of the color filters by having peak responses in the white light spectrum corresponding to the bandpass spectra of the red and blue color filters whereby the white light more effectively matches the responses of the color filters.

Claims

1. An OLED device for producing white light which more effectively matches the response of multicolor filters in an OLED device, comprising:

a) an anode and a spaced cathode;

b) an organic EL element disposed between the anode and cathode having at least two different dopants for collectively emitting white light;

c) a color filter array disposed over the EL element and including at least three separate filters having bandpass spectra for passing red, green, and blue light, respectively, in response to white light to produce preselected color outputs; and

d) the composition of one or more of the dopants being selected to change the spectrum of the white light to be compatible with the spectrum of the color filters by having peak responses in the white light spectrum corresponding to the bandpass spectra of the red and blue color filters so that the white light more effectively matches the responses of the color filters.

2. The OLED device of claim 1 wherein the organic EL element includes a first layer having a dopant for substantially emitting light in the blue region and less light in the green region, and a second layer having a dopant for substantially emitting light in the red region and less light in the green region of the spectrum.

3. The OLED device of claim 1 wherein the bandpass spectrum of the red color filter is from 605 nm to 700 nm.

4. The OLED device of claim 1 wherein the bandpass spectrum of the green color filter is from 495 nm to 555 nm.

5. The OLED device of claim 1 wherein the bandpass spectrum of the blue color filter is from 435 nm to 480 nm.

6. The OLED device of claim 1 wherein the organic EL element includes:

i) a hole-transporting layer disposed over the anode;

ii) a blue light-emitting layer including a host material and a light-emitting blue dopant disposed over the hole-transporting layer;

iii) an electron-transporting layer disposed over the blue light-emitting layer; and

iv) the hole-transporting layer including a light-emitting yellow dopant and a light-emitting red dopant.

7. The OLED device of claim 6 wherein the host material in the blue light-emitting layer includes an anthracene derivative having hydrocarbon or substituted-hydrocarbon substituents at the 9 and 10 positions.

8. The OLED device of claim 6 wherein the light-emitting blue dopant includes perylene or a derivative of perylene.

9. The OLED device of claim 6 wherein the light-emitting blue dopant includes a blue-emitting derivative of a distyrylbenzene or a distyrylbiphenyl.

10. The OLED device of claim 6 wherein the light-emitting blue dopant includes a compound of the structure

11. The OLED device of claim 6 wherein the light-emitting blue dopant includes a compound of the structure:

12. The OLED device of claim 6 wherein the light-emitting blue dopant includes a compound of the structure:

13. The OLED device of claim 6 wherein the light-emitting yellow dopant includes a compound of the following structure:

14. The OLED device of claim 6 wherein the light-emitting red dopant includes a diindenoperylene compound of the following structure:

15. The OLED device of claim 6 wherein the light-emitting red dopant includes:

16. The OLED device of claim 6 further including a layer having a light-emitting green dopant which produces green light that substantially matches the color response of the green color filter without causing degradation of the red and blue colors.