| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject material capable of highly luminant and highly efficient light emission by low-voltage drive, excellent in stability when repeatedly used, and capable of uniform planar light emission by including a specific benzopyran compound. SOLUTION: This material is obtained by incorporating a compound of formula I [R1 to R8 are each H or a substitutent; X is O, S or a group NR; R is H, an aliphatic hydrocarbon or the like; Y is O, S, or a group CQ1(Q2); Q1 and Q2 are each H or a substitutent, and at least one of them is an electron attractive group or they form a ring by being bound to each other; Z is a group OM or the like; M is a heterocyclic ring, cation or the like] (e.g. a compound of formula II). The compound of formula I is obtained, for instance, by formylation of a compound of formula III followed by reaction of the product with a compound of formula IV (e.g. 2-benzimidazolyl acetonitrile) in the presence of a base such as piperidine to be cyclized, and then by reacting the product with a compound of formula V (L1 and L2 are each an eliminable group) (e.g. phenyl chloroformate) in the presence of a base such as pyridine to be cyclized.
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