CPC H10K 85/30 (2023.02) [C07F 7/24 (2013.01); C09K 11/06 (2013.01); C09K 2211/1007 (2013.01); C09K 2211/1011 (2013.01); H10K 50/11 (2023.02); H10K 2102/351 (2023.02)] | 3 Claims |
1. An electroluminescent device having an anode, a cathode, and a light-emitting layer between the anode and the cathode, wherein the light-emitting layer is composed of an organic-inorganic perovskite satisfying the following requirements (1) and (2) and represented by the formula (A) below:
ET<ET1 (1)
ES-ET≤0.1 eV (2)
wherein ES represents an excited singlet energy level in emission of an inorganic component constituting the organic-inorganic perovskite, ET represents an excited triplet energy level in emission of an inorganic component constituting the organic-inorganic perovskite, ET1 represents an excited triplet energy level in emission of an organic component constituting the organic-inorganic perovskite
PEA2FAn−1PbnBr3n+1 (A)
wherein PEA represents a phenylethylammonim, FA represents a formamidinium, and n is 8.
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