Organic electroluminescent display device

An organic electroluminescent display device, comprising:

• a substrate;
• an organic electroluminescent layer;
• an upper electrode and a lower electrode sandwiching therein the or organic electroluminescent layer, either one of said upper and lower electrodes being a transparent electrode, and the other being a reflecting electrode;
• and
• a charge transport layer disposed between the organic electroluminescent layer and the substrate,
• wherein the charge transport layer contains a tosylate salt and an oxide of at least one of cerium (Ce), neodymium (Nd), or zirconium (Zr).

An organic electroluminescent display device, comprising:

• a substrate;
• an organic electroluminescent layer;
• an upper electrode and a lower electrode sandwiching therein the organic electroluminescent layer, either one of said upper and lower electrodes being a transparent electrode, and the other being a reflecting electrode;
• and
• a charge transport layer disposed between the organic electroluminescent layer and the substrate,
• wherein the charge transport layer contains a tosylate salt, a titanium compound and a lipophilic smectite.

An organic electroluminescent display device, comprising:

• a substrate;
• an organic electroluminescent layer;
• an upper electrode and a lower electrode sandwiching therein the organic electroluminescent layer, either one of said upper and lower electrodes being a transparent electrode, and the other being a reflecting electrode;
• and
• a charge transport layer disposed between the organic electroluminescent layer and the substrate,
• wherein the charge transport layer contains iodine, a titanium compound and a lipophilic smectite.