| 摘要 |
An OLED device comprises a cathode, an anode, a light-emitting layer, and, between the cathode and the light emitting layer, a non-emitting layer containing a metal complex of "n" bidentate ligands having Formula (1): [insert structure here] wherein: M represents Ga, Al, Be, or Mg; n is 3 in the case of Ga or Al and 2 in the case of Be or Mg; and each Za and each Zb is independently selected and each represents the atoms necessary to complete an unsaturated ring; Za and Zb are directly bonded to one another provided Za and Zb may be further linked together to form a fused ring system; provided that the light emitting layer is substantially free of said metal complex present in the non-emitting layer. Such a device exhibits improved luminous efficiency.
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