ORGANIC LIGHT-EMITTING ELEMENT, METHOD FOR EVALUATING DELAYED FLUORESCENCE MATERIAL, METHOD FOR DESIGNING DELAYED FLUORESCENCE MATERIAL, METHOD FOR DESIGNING ORGANIC LIGHT-EMITTING ELEMENT, AND PROGRAM
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United States of America
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Issued Date -
Mar 6, 2025
app pub date -
Mar 2, 2023
filing date -
Mar 2, 2023
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Abstract
An organic light emitting device having a light emitting layer that contains a delayed fluorescent material having a ΔE(Tn−S1) of less than 0.10 eV and a ΔE(Tn−T1) of less than 0.15 eV, has excellent durability. Tn represents an excited triplet having the smallest energy among excited triplets having larger energies than the lowest excited singlet energy of the delayed fluorescent material; ΔE(Tn−S1) represents the difference between the energy of Tn and the lowest excited singlet energy of the delayed fluorescent material; and ΔE(Tn−T1) represents the difference between the energy of Tn and the lowest excited triplet energy of the delayed fluorescent material.
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