White OLED with two blue light-emitting layers

• US 8,877,350 B2
• Filed: 12/11/2007
• Issued: 11/04/2014
• Est. Priority Date: 12/11/2007
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Inventors: Spindler, Jeffrey P., Hatwar, Tukaram K.
• Primary Examiner(s): CLARK, GREGORY D
• Application Number:
  US11/954,083
• Publication Number:
  US 20090146552A1
• Time in Patent Office: 2,520 Days
• Field of Search: 428/690, 428/917, 313/504, 313/505, 313/506, 257/40, 257/E51.05, 257/E51.026, 257/E51.032
• 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 50/19 Tandem OLEDs
• CPC Class Codes: H10K 59/32 Stacked devices having two or more layers, each emitting at different wavelengths
• CPC Class Codes: Y10S 428/917 Electroluminescent

Abstract

An organic white light-emitting device, including a substrate; an anode and a cathode spaced from each other; a light-emitting layer including a yellow dopant for emitting yellow light; and first and second blue light-emitting layers, each blue light-emitting layer having at least one different material than the other blue light-emitting layer.

Claims

1. An organic white light-emitting device, comprising:

(a) a substrate;

(b) an anode and a cathode spaced from each other;

(c) a yellow light-emitting layer comprising a yellow dopant for emitting yellow light;

wherein the yellow light-emitting layer further comprises a dinaphthyl anthracene host and an aromatic tertiary amine co-host, and the yellow dopant is a rubrene derivative;

(d) first and second blue light-emitting layers, each blue light-emitting layer having at least one different material than the other blue light-emitting layer; and

wherein the first blue light-emitting layer is in direct contact with the yellow light-emitting layer and the second blue light-emitting layer is adjacent to the first blue light-emitting layer,

wherein the first blue light-emitting layer comprises a dinaphthyl anthracene host, an aromatic tertiary amine co-host up to 12% by volume, and a blue dopant that is a bis(azinyl)azene boron complex compound according to formula K;

2. The organic white light-emitting device of claim 1 wherein the blue light emitted from the first and second blue light-emitting layers have emissive spectrums that are different from each other.

3. The organic white light-emitting device of claim 1 wherein the blue dopant in the second blue light-emitting layer is a

bis[2-[4-[N,N-diarylamino]phenyl]vinyl]biphenyl.

6. The organic white light-emitting device of claim 1 wherein the blue dopant in the second blue light-emitting layer is a [N,N-diarylamino][2-[4-[N,N-diarylamino]phenyl]vinyl]biphenyl.

7. The organic white light-emitting device of claim 1 wherein the second blue light-emitting layer further comprises an aromatic tertiary amine co-host.

4. A tandem organic white light-emitting device, comprising:

(a) a substrate, an anode and a cathode spaced from each other and two or more light-emitting units disposed between the anode and cathode and an intermediate connector disposed between the two or more light-emitting units; and

(b) at least one of the light-emitting units having;

(i) a yellow light-emitting layer comprising a yellow dopant for emitting yellow light;

wherein the yellow light-emitting layer further comprises a dinaphthyl anthracene host and an aromatic tertiary amine co-host, and the yellow dopant is a rubrene derivative;

(ii) first and second blue light-emitting layers, each blue light-emitting layer having at least one different material than the other blue light-emitting layer; and

wherein the first blue light-emitting layer is in direct contact with the yellow light-emitting layer and the second blue light-emitting layer is adjacent to the first blue light-emitting layer,

wherein the first blue light-emitting layer comprises a dinaphthyl anthracene host, an aromatic tertiary amine co-host, and a blue dopant that is a bis(azinyl)azene boron complex compound according to formula K;

5. The organic white light-emitting device of claim 4 wherein the blue light emitted from the first and second blue light-emitting layers have emissive spectrums that are different from each other.

8. The organic white light-emitting device of claim 4 wherein the blue dopant in the second blue light-emitting layer is a [N,N-diarylamino][2-[4-[N,N-diarylamino]phenyl]vinyl]biphenyl.