| 摘要 |
Electronic devices including a layer that contains a photoactive material, wherein an excited state of the photoactive material has an excitation energy E<SUB>ex </SUB>and wherein the photoactive material is either: (1) not a guest in a composition including a host, or (2) is a guest in a composition including a guest and a host, with the proviso that an electronic transport material is not included in the composition having the the guest and the host; and a charge transport layer located between the electrode and the photoactive layer, wherein the charge transport material has a triplet energy level that is higher than E<SUB>ex</SUB>. Alternatively, the layer includes a composition having the photoactive material as a guest, a host, and an electron charge transport material, and the device has two charge transport layers wherein both charge transport layers include a material having a triplet energy level that is higher than E<SUB>ex</SUB>.
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