White-light-emitting material for organic electroluminescent devices

• Published in: Japanese Journal of Applied Physics Vol. 35; no. 10B; pp. L1339 - L1341
• Main Authors: HAMADA, Y, SANO, T, FUJII, H, NISHIO, Y, TAKAHASHI, H, SHIBATA, K
• Format: Journal Article
• Language: English
• Published: Tokyo Japanese journal of applied physics 15.10.1996
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electroluminescence; Exact sciences and technology; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other luminescence and radiative recombination; Physics; Transition element complexes; White light; Photoluminescence; Organic ligand; Zinc complexes; Electroluminescence; Experimental study
• ISSN: 0021-4922; 1347-4065
• DOI: 10.1143/JJAP.35.L1339

White emission is important for applying organic EL devices to full-color 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 reliability and productivity. A device structure of indium-tin-oxide (ITO, anode)/hole transport layer/emitting layer/MgIn alloy (cathode) was employed. Bis(2-(2-hydroxyphenyl)benzothiazolate)zinc ( Zn(BTZ) 2 ) was used as the emitting material. Zn(BTZ) 2 showed greenish-white emission with a broad electroluminescent spectrum (half-width: 157 nm, peak 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 electron-transport property. As such, Zn(BTZ) 2 is expected to serve as a new white-light-emitting material for organic EL devices.