Controlling color shift in EL phosphors

Details Controlling color shift in EL phosphors Controlling color shift in EL phosphors

1998-11-05

2000-08-29

Philogene, Haissa

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

315209R, 315291, 315176, 3151691, G09G 310

Patent

active

06111362&

ABSTRACT:
An EL lamp is powered by bursts of high frequency signal repeated at low frequency, i.e. having a low duty cycle envelope, in order to shift the color of light emitted by the phosphor in the lamp without degrading the life of the lamp. The bursts include one or more consecutive cycles of a high frequency signal or several closely spaced cycles of a high frequency signal.

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patent: 5502357 (1996-03-01), Kimball
Thornton, W.A.; "Electroluminescence Maintenance"; J. Electrochem. Soc.; 107 (1960) 895.
Eckersley, R.T. et al.; "Emission Spectra Analysis . . . "; SID 93 Digest; pp. 588-591; (1993).
Eckersley, R.T. et al.; "Analysis of Voltage and Frequency Dependence . . . "; Proc. 6th EL Workshop; pp. 274-279; (May 1992).
Ichihara, T. et al.; "Spectral Characteristics . . . "; 6th EL Workshop; translation; (May 1992).
Matossi, F. et al.; "Electroluminescence Excited by Short Field Pulses"; Physical Review; vol. 99, No. 4; pp. 1100-1103; (1955).

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