Patent ID: 6447934
Filing Date: 2002-09-10
Classification: H01L,Y10S,Y10T

Abstract:
An organic electroluminescent panel comprising:an anode; a cathode; and a luminescent layer interposed between the anode and the cathode, the luminescent layer including a hole transport luminescent layer positioned at an anode side and an electron transport luminescent layer positioned at a cathode side, both the hole transport and the electron transport luminescent layers directly contacting each other; the hole transport luminescent layer comprising hole transport host material and a first fluorescent material doped in the hole transport host material, the hole transport host material having a solid state fluorescent peak in a wavelength range of 380 nm to 510 nm; the electron transport luminescent layer comprising an electron transport host material and a second fluorescent material doped in the electron transport host material, the electron transport host material having a solid state fluorescent peak in a wavelength range of 380 nm to 510 nm; a solid state fluorescent spectrum of each of the first and second fluorescent materials either overlaps the solid state fluorescent spectrums of both host materials or is positioned at a longer wavelength side thereof; and wherein a difference between a minimum energy level difference in a conduction band between the hole transport host material and the electron transport host material and a maximum energy level difference in a valence band between the hole transport host material and the electron transport host material is less than 0.2 eV.