Article

Piezoelectric/electroluminescent composites for low voltage input flat-panel display devices

Graduate School of the Chinese Academy of Sciences Beijing 100049 P.R. China
Applied Physics A (impact factor: 1.63). 02/2008; 90(4):729-731. DOI:10.1007/s00339-007-4343-8 pp.729-731

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.

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Keywords

combined functions
 
Cu
 
driving frequency
 
electro-mechano-optical conversion
 
electroluminescent characteristics
 
emission brightness
 
fabricate multiple function composites
 
low exciting voltage
 
naked eye strong green-light emission
 
piezoelectric/electroluminescent composites
 
promising path
 
resonating characteristics
 
ZnS-type electroluminescence phosphor