An AC (alternating current) LED exhibited the advantages of a low drive current, low static electricity, lack of a need for a rectifier, and high extraction efficiency. The input operating voltage of an AC LED is around 80V, and its operating frequency is 120 Hz or less. When the voltage is converted, a time gap of 1/120 s (10 ms), called dead time, is generated. This time gap is closely related to the scintillation phenomenon. Therefore, AC LEDs that have a phosphor composition, whose half-life composition can compensate for dead time that is generated during the voltage conversion, are sought to solve the problem of scintillation. The object of this work is to provide a phosphor SrSi(2)O(2)N(2):Eu(2+),Mn(2+) for AC LEDs, in which the dead time that is generated during the voltage conversion is compensated for by the half-life of the phosphor.
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| http://dx.doi.org/10.1364/OE.20.018031 | DOI Listing |
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