White OLED with two blue light-emitting layers

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:

wherein:

A and A′ represent independent azine ring systems corresponding to 6-membered aromatic ring systems containing at least one nitrogen;

(X a ) n and (X b ) m represent one or more independently selected substituents and include acyclic substituents or are joined to form a ring fused to A or A′;

m and n are independently 0 to 4;

Z a and Z b are independently selected substituents;

1, 2, 3, 4, 1′, 2′, 3′, and 4′ are independently selected as either carbon or nitrogen atoms; and

provided that X a , X b , Z a , and Z b , 1, 2, 3, 4, 1′, 2′, 3′, and 4′ are selected to provide blue luminescence; and

wherein the second blue light-emitting layer comprises a dinaphthyl anthracene host, and a blue dopant that is a styrylbiphenyl derivative having a plurality of diarylamino substituents.

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.

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:

wherein:

A and A′ represent independent azine ring systems corresponding to 6-membered aromatic ring systems containing at least one nitrogen;

(X a ) n and (X b ) m represent one or more independently selected substituents and include acyclic substituents or are joined to form a ring fused to A or A′;

m and n are independently 0 to 4;

Z a and Z b are independently selected substituents;

1, 2, 3, 4, 1′, 2 ′, 3 ′, and 4 ′ are independently selected as either carbon or nitrogen atoms; and

provided that X a , X b , Z a , and Z b , 1, 2, 3, 4, 1′, 2′, 3′, and 4′ are selected to provide blue luminescence; and

wherein the second blue light-emitting layer comprises a dinaphthyl anthracene host, and a blue dopant that is a styrylbiphenyl derivative having a plurality of diarylamino substituents.

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.

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.

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.