Piezoelectric/electroluminescent composites for low voltage input flat-panel display devices
ABSTRACT In the present work, we report enhanced electro-mechano-optical conversion in piezoelectric/electroluminescent composites,
composed of ZnS-type electroluminescence phosphor (doped with Cu, Cl, Mn) placed adjacent to a single-crystal piezoelectric
transformer. The effect originates from the combined functions of electroluminescent characteristics and amplified piezoelectric
effects. The composites can realize a comparatively low exciting voltage of 2 V rms to start electroluminescence in various
materials. Through the naked eye strong green-light emission can be seen under an input voltage of 4.95 V rms. We can easily
control the emission brightness by adjusting the driving frequency due to the resonating characteristics of the piezoelectric
transformer. This provides a promising path for us to fabricate multiple function composites.