Patent ID: 8072146

Claim:
A fluorescent lamp comprising: a tube configured in a tubular shape having a first end and a second end, an inner surface of the tube including a phosphor layer; at least one first electrode unit located at the first end of the tube, the electrode unit including an emitter electrode configured with a crystalline semiconductor material having an electrical conductivity and including a concave portion facing towards the second end of the tube, and the electrode unit including a stem lead located opposite to the emitter electrode and extending away from the tube in order to receive a power supply, wherein the stem lead and emitter electrode are configured as one integral and continuous body made from the same material; at least one welding bead located between the first end of the tube and the electrode unit, the welding bead sealing the first end of the tube with the electrode unit in an air proof state; and a filler gas located in the tube.