White ACPEL Device with ZnS:Cu,Cl, Tb3Al5O12:Ce3+, and CaS:Eu2+ Phosphors Using a Layered Structure

ETRI Journal

关键词: CRI;    ACPEL;    CaS:Eu;    TAG:Ce;    Cl;    ZnS:Cu;   

Others  :  1185756
DOI  :  10.4218/etrij.09.0209.0235

【 摘 要 】

Improvement of the color rendering index (CRI) and luminance of a white alternate current powder electroluminescent (ACPEL) device has been attempted using ZnS:Cu,Cl, Tb₃Al₅O₁₂:Ce (TAG:Ce), and CaS:Eu phosphors with a layered structure. The device with TAG:Ce and ZnS:Cu,Cl phosphors showed a CRI of 75, with a luminance increase of about 30% depending on the thickness of the TAG:Ce. Further CRI improvement was attempted using CaS:Eu. When they were separately screen-printed, the CRI was increased up to 89 with no decrease in luminance.

   

【 参考文献 】

• [1]Y.A. Ono, Electroluminescent Displays, World Scientific, Singapore, 1995.
• [2]Y.H. Kim et al., "3.5-Inch QCIF AMOLED Panels with Ultra-Low-Temperature Polycrystalline Silicon Thin Film Transistor on Plastic Substrate," ETRI J., vol. 30, no. 2, 2008, pp. 308.
• [3]Z. Yan, Z. Chengjiu, and J. Dapeng, "White Electroluminescent Material," CN patent 1340590, 2002.
• [4]C. Chau, "High CRI Electroluminescent Lamp," US patent 0066209, 2006.
• [5]J.H. Park et al., "White-Electroluminescent Device with ZnS:Mn, Cu,Cl phosphor," J. Lumin., vol. 126, 2007, pp. 566.
• [6]H.S. Jang et al., "Enhancement of Red Spectral Emission Intensity of Y3Al5O12:Ce3+ Phosphor via Pr Co-doping and Tb Substitution for the Application to White LEDs," J. Lumin., vol. 126, 2007, p. 371.
• [7]B.J. Park et al., "Internal Pressure Effect on Cathodoluminescence Enhancement of ZnS:Mn2+ Synthesized by a Sealed Vessel," J. Mater. Res., vol. 22, no. 10, 2007, pp. 2838-2844.
• [8]A. Hobby, "Printing Thick Film Hybrids," DEK Printing Machines User Manual, 1997.