| abstract |
The present invention relates to a bisbiguanide having a rigid 2,2'-biphenoxy bridge for various applications, and for a novel bismuthimine having a rigid 2,2'-biphenoxy bridge . The invention also relates to the use of the (these) compounds to improve the luminous efficiency of LEDs in color converters, to color converters and their uses, and to illumination devices comprising at least one LED or OLED and at least one color converter. The invention also relates to a printing ink formulation for security printing comprising at least one anthraquinone imine having a rigid 2,2'-biphenoxy bridge; and a security document. |