We demonstrated blue organic light-emitting devices employing a novel blue-light-material, 2,5,2 ',5 '-tetrakis (4 '-fluorostyryl) biphenyl as emitting layer. Maximum brightness and luminous efficiency were of 1828 cd/m(2) at 9 V drive voltage and of 1.92 cd/A at 16 V Commission Internationale de l'Eclairage (CIE) coordinates are x = 0.20 and y = 0.22. The device color purity was further improved by introducing 2,9-dimethyl-4,7-diphenyl- 1,10-phenanthroline as hole-blocking layer. Here, CIE coordinates are x = 0.16 and Y = 0.20. A maximum brightness 1834 cd/m(2) was achieved at 17 V The peak current efficiencies was 1.52 cd/A at 10 V. (c) 2005 Elsevier B.V. All rights reserved.