| 摘要 |
PROBLEM TO BE SOLVED: To enhance power efficiency by setting a peak value and a peak half-breadth value of light transmittance of at least one translucent electrode of two electrodes between which at least one organic layer is interposed in a specified range. SOLUTION: Light transmittance of at least one translucent electrode of an anode and a cathode between which a luminescent layer and a hole transport layer or an electron transport layer are interposed has a peak value of an emission spectrum peak wavelength ±100 nm and a peak half breadth of 1-350 nm, and high light-transmittance in a visual light whole region is made unnecessary. The surface resistance of this electrode is limited to 15 Ω/m2 or less, and this electrode is preferably formed in a multi-layer made of materials of at least two kinds or at least three kinds mainly comprising ITO, indium oxide, tin oxide, or indium oxide zinc oxide composite, and power efficiency is furthermore enhanced. Emission of the element in a pulse width of 10-9-10-3 second is preferable. Installation of a conductive polymer layer coming in contact with the anode is allowable, and the organic layer film can be made thick without increasing driving voltage. |
