| 摘要 |
PROBLEM TO BE SOLVED: To enable emission of fluorescent lights of various colors using a single type of light-emitting diode, by causing a phosphor to absorb a light emitted by a light-emitting diode which emits an ultraviolet light or a near ultraviolet light and to convert the absorbed light to a visible light. SOLUTION: A phosphor film 2 which absorbs an ultraviolet light or a near ultraviolet light and emits a visible fluorescent light is applied onto a light- emitting diode 1 which emits an ultraviolet light or a near ultraviolet light, thus constituting a light-emitting diode with a phosphor. As the light-emitting diode which emits an ultraviolet light or a near ultraviolet light, a light-emitting diode made of pn junction of a GaInN semiconductor may be used. This light- emitting diode normally emits a light of blue color. However, by causing a pulse-like large current to flow through the lightemitting diode, it may be used as the light-emitting diode which emits an ultraviolet light or a near ultraviolet light. By providing a reflection board 3 on which an Al thin film is bonded by vacuum evaporation, the light emission efficiency of the phosphor may be improved approximately 15%. |
