| abstract |
An organic light emitting device having an anode, a cathode and an organic layer disposed between the anode and the cathode is provided. In one aspect, the organic layer comprises a compound having at least one zwitterionic carbon donor ligand. In another aspect, the organic layer comprises a carbene compound, including the following: n n n n n n n n n n In another aspect, the organic layer comprises a carbene compound, including: n n n n n n n n n n In another aspect, the organic layer comprises a carbene compound that includes a triazole ring and has the structure: n n n n n n n n n n In another aspect, the organic layer comprises a carbene compound that includes a tetrazole ring and has the structure: |