Patent ID: 9155159
Filing Date: 2015-10-06
Classification: H01L,H05B

Abstract:
1. A light emitting device comprising: a substrate; two or more opposed electrodes provided on the substrate; and a luminescent layer provided between two of the electrodes; the light emitting device further optionally comprising a metal layer provided on the electrodes, wherein the luminescent layer contains, as a part of its chemical structure, a compound containing a moiety A having a sum atomic weight MA of 100 or more and quantum dots protected by a protecting material, the sum atomic weight MA of the moiety A is larger than one-third of the molecular weight of the compound comprising the moiety A, the protecting material contains, as a part of its chemical structure, a linking group having the function of connecting to a quantum dot surface and a moiety B that has a sum atomic weight MB of 100 or more, satisfies a relationship between the sum atomic weight MB and the sum atomic weight MA represented by formula (I), and satisfies the requirement that the sum atomic weight MB is larger than one-third of the molecular weight of the protecting material, a solubility parameter SA of the moiety A and a solubility parameter SB of the moiety B satisfy a relationship represented by formula (II): the compound comprising the moiety A constituting the luminescent layer is a compound represented by chemical formula (2), and the protecting material is a compound represented by chemical formula (3), wherein Ar are present in an identical molecule, they may be the same or different; and, when two or more repeating units represented by —(Ar 4 )— are present in an identical molecule, they may be the same or different, and wherein Ar when two or more repeating units represented by the repeating unit are present in an identical molecule, they may be the same or different; and when two or more repeating units represented by —(Ar 8 )— are present in an identical molecule, they may be the same or different.