| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light emitting material that can suppress the decrease of light-emission luminance of an organic EL device, a method of purifying a light emitting material, and a method of manufacturing a light emitting layer by which a light emitting layer excellent in light emitting performance can be formed easily and consistently. <P>SOLUTION: In an organic EL device 1, when a voltage is applied across an anode 3 and a cathode 5, holes are moved in a hole transport layer 41 and electrons are moved in an electron transport layer 43, and the holes and the electrons are recombined in a light emitting layer 42 to emit light. The light emitting material is used to form the light emitting layer 42. When the light emitting layer 42 is formed using the light emitting material, the light emitting layer 42 contains one or more kinds of metallic impurities, but the amount of a metallic impurity of which content is the largest among the metallic impurities contained in the layer is 2.5 ppm or less, or when the light emitting material is dissolved in a liquid so that the concentration thereof becomes 2.0 wt%, the liquid contains one or more kinds of metallic impurities, but the amount of the metallic impurity of which content is the largest among the metallic impurities contained in the liquid is 50 ppb or less. By using such a light emitting material, the decrease of light-emission luminance of the organic EL device 1 can be suppressed. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
