White light emitting an organic electroluminescent element and white light emitting organic electroluminescent plate

摘要

It is a white light emitting an organic electroluminescent element with a high power output, and a better a function of the viewing angle is proposed.The white light emitting organic electroluminescent element has at least four types of light - emitting dopants with different maximum emission wavelengths between a cathode and anode are arranged. The four types of light - emitting dopants comprise a light - emitting dopants a, a light - emitting dopants b, a light - emitting dopants c and a light - emitting dopants d, the maximum wavelengths, the order in the longer. The white light emitting organic electroluminescent element has an emission spectrum, comprising the following relationships: (first average luminous intensity for an angle in the range of 50° to 70° / first front light density) & (second average luminous intensity for an angle in the range of 50° to 70° / second front light density); and (third average luminous intensity for an angle in the range of 50° to 70° / third front light density) & (fourth average luminous intensity for an angle in the range of 50° to 70° / fourth front light density). The (first average luminous intensity for an angle in the range of 50° to 70°) is in the form of a average luminous intensity for an angle in the range of 50° to 70° in the case of the maximum wavelength of the light - emitting dopants a defined. The (first front light density) is in the form of a front light density in the case of the maximum wavelength of the light - emitting dopants a defined. The (second average luminous intensity for an angle in the range of 50° to 70°) is in the form of a average luminous intensity for an angle in the range of 50° to 70° in the case of the maximum wavelength of the light - emitting dopants d. The (second front light density) is in the form of a front light density in the case of the maximum wavelength of the light - emitting dopants d. The (third average luminous intensity for an angle in the range of 50° to 70°) is in the form of a average luminous intensity for an angle in the range of 50° to 70° in the case of the maximum wavelength of the light - emitting dopants c defined. The (third front light density) is in the form of a front light density in the case of the maximum wavelength of the light - emitting dopants c defined. The (fourth average luminous intensity for an angle in the range of 50° to 70°) is in the form of a average luminous intensity for an angle in the range of 50° to 70° in the case of the maximum wavelength of the light - emitting dopants b defined. The (fourth front light density) is in the form of a front light density in the case of the maximum wavelength of the light - emitting dopants b defined.