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Glass tube of high dielectric constant and low dielectric loss for external electrode fluorescent lamps

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11 Author(s)
Guangsup Cho ; Department of Electrophysics, Kwangwoon University, 447-1 Wallgye-Dong, Nowon-Gu, Seoul, Korea 139-701 ; Shin, Myeong-Ju ; Jong-Mun Jeong ; Jung-Hyun Kim
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A glass tube of aluminosilicate glass, with high dielectric constant K∼6.0 and low dielectric loss tan δ∼8.0×10-4, was investigated for the external electrode fluorescent lamps (EEFLs) of a dielectric barrier discharge. Compared with conventional EEFLs made out of borosilicate glass tubes with K∼(4.9-5.3) and tan δ∼(2.3-2.4)×10-3, the efficiency of the aluminosilicate EEFL increases by 15%-25% even at high luminance above 20 000 cd/m2 and the pinhole stability of the aluminosilicate EEFL also improves remarkably. In a soda-lime glass EEFL with a high dielectric loss tan δ∼7.0×10-3, the luminance and pinhole stability deteriorate even with a high dielectric constant K∼7.2 at room temperature, because the value of tan δ escalates as the temperature on the external electrode increases due to the dielectric heat dissipation.

Published in:

Journal of Applied Physics  (Volume:102 ,  Issue: 11 )

Date of Publication:

Dec 2007

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