| 摘要 |
A form of zirconium quinolate is disclosed having a monoclinic crystal structure, P21/c space group, unit cell dimensions a = 11.22 Å, b = 14.67 Å, c = 17.21 Å a = 90°, ß = 94.816°, Y = 90° and unit cell volume 2822.7 Å3. It may be made by reacting a zirconium alkoxide with 8-hydroxyquinoline in a solvent comprising tetrahydrofuran, recovering the zirconium quinolate and purifying it by sublimation. It is useful e.g. as a host in an electroluminescent layer of an organic light-emitting diode, and/or in an electron transport layer. After initial purification is is sublimeable substantially without residue and when used as an electron transport layer in an OLED increases the luminance of the OLED and reduces the turn-on voltage compared to either aluminium quinolate or zirconium quinolate made by the earlier chloride route. |
