申请人:Hodogaya Chemical Co., Ltd.
公开号:EP3432688A1
公开(公告)日:2019-01-23
[Object] To provide an organic electroluminescence device including, in order to improve the device characteristics of the organic electroluminescence device, particularly, to absorb light having the wavelengths of from 400 nm to 410 nm from sunlight, not to affect a material inside the device, and to significantly improve the light extraction efficiency, a capping layer formed of a material that has a high absorption coefficient, a high refractive index, and an excellent stability, durability, and light resistance of a thin film, and does not absorb light in the blue, green, and red wavelength range.
[Solving Means] An organic electroluminescence device including at least an anode electrode, a hole transport layer, a light emitting layer, an electron transport layer, a cathode electrode, and a capping layer in the stated order, in which the capping layer includes a material having an extinction coefficient of not less than 0.3 at wavelengths of from 400 nm to 410 nm and an absorbance of not less than 0.2 at wavelengths of from 400 nm to 410 nm in an absorption spectrum of a concentration of 10-5 mol/l.
[目的] 提供一种有机电致发光器件,包括:为了改善有机电致发光器件的器件特性,特别是吸收来自太阳光的波长为400 nm至410 nm的光,而不影响器件内部的材料、为了显著提高光萃取效率,需要一种由具有高吸收系数、高折射率、优异的薄膜稳定性、耐久性和耐光性,并且不吸收蓝色、绿色和红色波长范围内的光的材料形成的封盖层。
[解决手段】一种有机电致发光器件,至少包括按所述顺序排列的阳极电极、空穴传输层、发光层、电子传输层、阴极电极和封盖层,其中,封盖层包括一种材料,该材料在波长为 400 纳米至 410 纳米的吸收光谱中,消光系数不小于 0.3,在波长为 400 纳米至 410 纳米的吸收光谱中,吸光度不小于 0.2,浓度为 10-5 摩尔/升。