Organic electroluminescent device
View Patent ↗Disclosed is an organic electroluminescent device including a first electrode, a second electrode, and a light-emitting layer having a guest material of a red luminescent material and at least two host materials so as to be formed between the first and second electrodes. One of the host materials is a composite including the following structural formula: Moreover, one of the host materials can be a substituted or non-substituted quinoline derivative.
1. An organic electroluminescent device comprising:
a first electrode;
a second electrode; and
a light-emitting layer having a guest material of a red luminescent material and first and second host materials formed between the first and second electrodes;
wherein the first host material is an aromatic compound having one of the following structural formula;
the second host material is a compound Alq 3 which has the following structural formula;
and the guest material is a DCM Derivative which has the following structural formula;
wherein the light emitting layer with the guest material and the first and second host materials enhances red luminescence efficiency of the device and has similar CIE coordinates of a red color in comparison with a red light emitting layer comprising the second host material alone with the guest material, wherein the first host material alone has a first PL peak value at a first wavelength, the second host material alone has a second PL luminescent peak value at a second wavelength, and the first and second host materials together have a third PL peak value at a third wavelength band between the first and second wavelengths.
2. The organic electroluminescent device of claim 1 , wherein an electron injection/transport layer is formed between the second electrode and light-emitting layer.
3. The organic electroluminescent device of claim 1 , wherein the light-emitting layer has a composition of 0.01˜30 wt. % of the guest material, 0.05˜99.9 wt. % of the first host material and the second host material.
4. The organic electroluminescent device of claim 1 , wherein a maximum PL luminescence peak of the guest material is equal to or greater than 550 nm.