A luminescent film includes a host compound, a blue phosphorescent compound, and a blue fluorescent compound, in which an emission spectrum of the blue phosphorescent compound and an absorption spectrum of the blue fluorescent compound have portions overlapping with each other; shortest wavelength-side maximum emission wavelengths of the blue phosphorescent compound (abbreviated as “BPM” in the expression) and the blue fluorescent compound (abbreviated as “BFM” in the expression) satisfy the following expression (1): λBFM≥λBPM: expression (1) in which λBFM represents the shortest wavelength-side maximum emission wavelength of the blue fluorescent compound and λBPM represents the shortest wavelength-side maximum emission wavelength of the blue phosphorescent compound; and light emission derived from the blue fluorescent compound is detected.
一种发光膜包括主化合物、蓝色
磷光化合物和蓝色荧光化合物,其中蓝色
磷光化合物的发射光谱和蓝色荧光化合物的吸收光谱具有重叠部分;蓝色
磷光化合物和蓝色荧光化合物分别在短波长端的最高发射波长(分别简称为“BPM”和“B
FM”)满足以下表达式(1):λB
FM≥λBPM;其中,λB
FM代表蓝色荧光化合物的短波长端最高发射波长,λBPM代表蓝色
磷光化合物的短波长端最高发射波长;并且检测到由蓝色荧光化合物发出的光。