Electroluminescent film device

• US 20020179899A1
• Filed: 08/29/2001
• Published: 12/05/2002
• Est. Priority Date: 05/29/2001
• Status: Abandoned Application

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Aratani, Sukekazu, Nakayama, Takahiro
• Application Number:
  US09/940,638
• Publication Number:
  US 20020179899A1
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 85/324 comprising aluminium, e.g. Alq3
• CPC Class Codes: H10K 85/341 Transition metal complexes, e.g. Ru(II)polypyridine complexes H10K85/331 takes precedence
• CPC Class Codes: H10K 85/342 comprising iridium
• CPC Class Codes: H10K 85/615 Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
• CPC Class Codes: H10K 85/631 Amine compounds having at least two aryl rest on at least one amine-nitrogen atom, e.g. triphenylamine
• CPC Class Codes: H10K 85/649 Aromatic compounds comprising a hetero atom

Abstract

The present invention aims at high-efficient light emission in an organic light emitting device. That is, in the light-emitting layer 14 of the organic light-emitting device of the present invention, a spin conversion material 14a is used as a main material and a light-emitting material 14b is added separately, whereby an excited state is utilized efficiently.

Claims

1. An electroluminescent film device having a light-emitting layer where an excited state generated by electron-hole recombination is utilized for photon generation, in which device the light-emitting layer contains;

a material in which the quantum number of orbital angular momentum and the quantum number of excited state spin are convertible into each other by their interaction, and

a light-emitting molecule mixed into the above material.

2. An electroluminescent film device according to claim 1, wherein the material in which the quantum number of orbital angular momentum and the quantum number of excited state spin are convertible into each other by their interaction, is a molecule in which a heavy metal atom is bonded to or coordinated to an organic material.

3. An electroluminescent film device according to claim 2, wherein the heavy metal atom is Ir or Pt.

4. An electroluminescent film device according to claim 1, wherein the light-emitting molecule is a molecule in which a heavy metal atom is bonded to or coordinated to an organic material.

5. An electroluminescent film device according to claim 4, wherein the heavy metal atom is Ir or Pt.

6. An electroluminescent film device having a light-emitting layer where an excited state generated by electron-hole recombination is utilized for photon generation, in which device the light-emitting layer is an organic film formed by simultaneous vapor deposition, containing:

a material in which the quantum number of orbital angular momentum and the quantum number of excited state spin are convertible into each other by their interaction, and

a light-emitting molecule, each as an independent dopant.

7. An electroluminescent film device according to claim 6, wherein the material in which the quantum number of orbital angular momentum and the quantum number of excited state spin are convertible into each other by their interaction, is a molecule in which a heavy metal atom is bonded to or coordinated to an organic material.

8. An electroluminescent film device according to claim 7, wherein the heavy metal atom is Ir or Pt.

9. An electroluminescent film device according to claim 6, wherein the light-emitting molecule is a molecule in which a heavy metal atom is bonded to or coordinated to an organic material.

10. An electroluminescent film device according to claim 9, wherein the heavy metal atom is Ir or Pt.