Organic light-emitting device and light-emitting apparatus comprising the device

Platinum and iridium are both noble metals, and therefore the their complexes are also expensive, producing bad effects on cost reduction in the future, too. A triplet light-emitting material is provided inexpensively more than conventional. An inexpensive bright organic light-emitting device of low power consumption and a light-emitting apparatus using the organic light-emitting device are also provided. The organic light-emitting device capable of converting the triplet excitation energy to light emission can be produced by applying a chelate complex of which the central metal is tungsten, which is an inexpensive, heavy atom, to the organic light-emitting device. A bright, inexpensive light-emitting apparatus of low power consumption and an electric appliance using the light-emitting apparatus can be provided by applying the organic light-emitting device using metal complexes.