An organic electroluminescence device includes an anode, an emitting layer and a cathode. The emitting layer includes a first compound and a second compound. The first compound is a delayed fluorescent compound. The second compound is a fluorescent compound. A solution of the second compound in toluene has an emission peak wavelength in a range from 430 nm to 480 nm. A molar absorbance coefficient of the second compound at an absorption peak closest to a long-wavelength side is in a range from 29,000 L/(mol·cm) to 1,000,000 L/(mol·cm). The second compound has a Stokes shift in a range from 1 nm to 20 nm.
一种有机电致发光器件包括阳极、发光层和阴极。发光层包括第一种化合物和第二种化合物。第一种化合物是延迟荧光化合物。第二种化合物是一种荧光化合物。第二种化合物在
甲苯中的溶液的发射峰波长在 430 纳米到 480 纳米之间。第二种化合物在最靠近长波长侧吸收峰的摩尔吸光系数范围为 29,000 升/(摩尔-厘米)至 1,000,000 升/(摩尔-厘米)。第二种化合物的斯托克斯偏移范围为 1 纳米到 20 纳米。