[en] The preparation and properties of new boron complexes based on a N,O-ligated HBO and HBT ligands, were investigated as candidates for blue luminescent materials. Dyes 1 and 2 show good fluorescence efficiency and high photostability. Organic chromophores based on small molecules have attracted considerable attention over the past decades due to their potential applications including organic light-emitting diodes (OLEDs), solar cells, dye lasers, photosensitizers and molecular probes. A great variety of organic and organometallic luminescent molecules with different chemical/photophysical properties adapted to specific needs have been reported, and a number of those are also commercially available. Metal complexes based on the N- and/or O-donor ligands, have shown promising luminescent properties as efficient EL emitters. Among them, aluminum (III) complex of 8-hydroxy-quilonine (Alq₃) has been used as a green emitter and one of the stable electron transport materials with high emission efficiency. Similarly, zinc (II) complex and boron (III) complex of 8-hydroxyquilonine have been investigated as an EL materials in vapor-deposited films. In general, boron compounds are more stable than corresponding aluminum compounds, and boron difluoride dyes such as boron dipyrromethene (BODIPY) and boron diketonates possess remarkable properties such as large molar extinction coefficients, high fluorescence quantum yields and excellent photostability