WHITE-LIGHT-EMITTING MATERIAL FOR ORGANIC ELECTROLUMINESCENT DEVICES

White emission is important for applying organic EL devices to full-co lor displays and backlighting. In order to obtain white emission, the use of a white-light-emitting material which shows the white emission by itself is advantageous for these applications because of its high r eliability and productivity. A device structure of indium-tin-oxide (I TO, anode)/hole transport layer/emitting layer/MgIn alloy (cathode) wa s employed. Bis(2-(2-hydroxyphenyl)benzothiazolate)zinc (Zn(BTZ)(2)) w as used as the emitting material. Zn(BTZ)(2) showed greenish-white emi ssion with a broad electroluminescent spectrum (half-width: 157 nm, pe ak wavelength: 486, 524 nm). It exhibited a high luminance of 10, 190 cd/m(2) at the applied voltage of 8 V because Zn(BTZ)(2) has a good el ectron-transport property. As such, Zn(BTZ)(2) is expected to serve as a new white-light-emitting material for organic EL devices.