The effects of SCM and PWM on the chromaticity and the spectrum of PC white LEDs

Abstract

When phosphor converted white light emitting diodes were operated under stepwise current modulation (SCM) and pulse width modulation (PWM), the change in chromaticity and spectrum were investigated. In the chromaticity diagram, yellow shift was observed with increasing forward current in SCM while blue shift with increasing duty ratio in PWM In SCM, the… (More)

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