Patent ID: 7250117
Filing Date: 2007-07-31
Classification: C09K,H01L,H05B,Y10S

Abstract:
1. A luminescent medium, comprising a rare earth complex represented by the following formula (2): wherein Ln is a rare earth metal ion selected from the group consisting of europium, terbium and erbium; X and Y are the same or different and are individually O, S or Se; R1, R2, R3, R4, R5 and R6 are the same or different, excluding a situation where R1, R2, R3 and R4 are all the same as each other, and are individually an alkyl or alkoxy group of a linear or branched structure having not more than 20 carbon atoms, a phenyl group, a biphenyl group, a naphthyl group, a heterocyclic group or a substitution product of any of these groups; n is an integer ranging from 2 to 20; m and p are respectively an integer ranging from 1 to 5; and Z and W are the same or different and are individually a hydrogen atom, a deuterium atom, a halogen atom or an alkyl group.