Effects of Organic Binder and Film Thickness on Optoelectrical Properties of AC Powder EL Devices Prepared by Screen Printing Method for LCD Backlight Applications

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J. Korean Ceram. Soc. > Volume 38(12); 2001 > Article

Journal of the Korean Ceramic Society 2001;38(12): 1085.

LCD 백라이트를 위해 스크린 프린팅법으로 제조된 AC Powder EL 소자의 유기결합제와 막두께가 광전기적 성질에 미치는 영향

이강렬, 박성

명지대학교 무기재료공학과

Effects of Organic Binder and Film Thickness on Optoelectrical Properties of AC Powder EL Devices Prepared by Screen Printing Method for LCD Backlight Applications

ABSTRACT

The high efficient AC powder EL devices classified by low cost and low power consumption type fabricated using screen printing method with film thickness and organic binder. Brightness and current density were measured at frequency range of 400Hz∼1kHz and voltage range of 50∼300V$_$rms/ to estimate optoelectrical properties of AC powder EL devices, respectively. Frequency generator was used as system producing frequency and voltage of a sine wave. Also brightness and current density were measured by luminometer and multimeter. In the case of low cost type AC powder EL device, brightness and current density were about 43 cd/m$^2$and 20$mu$A/cm$^2$when the thickness of phosphor and dielectric layer was 45∼50$mu$m under no addition of plasticizer respectively. In the case of low power consumption type AC powder EL device, brightness and current density were about 74 cd/m$^2$and 30∼40$mu$A/cm$^2$when the thickness of phosphor and dielectric layer was 45∼50$mu$m and 15∼20$mu$m under addition of 15wt% plasticizer respectively. Also, AC powder EL device fabricated in this study showed absolutely excellent characteristics as the lifetime was longer than products of other company.

Key words: High efficient AC powder EL devices, Screen printing method brightness and current density, Optoelectrical properties