1333317-65-9Relevant academic research and scientific papers
High-efficiency tris(8-hydroxyquinoline)aluminum (Alq3) complexes for organic white-light-emitting diodes and solid-state lighting
Perez-Bolivar, Cesar,Takizawa, Shin-Ya,Nishimura, Go,Montes, Victor A.,Anzenbacher, Pavel
, p. 9076 - 9082 (2011)
Combinations of electron-withdrawing and -donating substituents on the 8-hydroxyquinoline ligand of the tris(8-hydroxyquinoline)aluminum (Alq 3) complexes allow for control of the HOMO and LUMO energies and the HOMO-LUMO gap responsible for emission from the complexes. Here, we present a systematic study on tuning the emission and electroluminescence (EL) from Alq3 complexes from the green to blue region. In this study, we explored the combination of electron-donating substituents on C4 and C6. Compounds 1-6 displayed the emission tuning between 478 and 526 nm, and fluorescence quantum yield between 0.15 and 0.57. The compounds 2-6 were used as emitters and hosts in organic light-emitting diodes (OLEDs). The highest OLED external quantum efficiency (EQE) observed was 4.6 %, which is among the highest observed for Alq3 complexes. Also, the compounds 3-5 were used as hosts for red phosphorescent dopants to obtain white light-emitting diodes (WOLED). The WOLEDs displayed high efficiency (EQE up to 19 %) and high white color purity (color rendering index (CRI≈85). Whiter than white: Electron-withdrawing and -donating substituents on the tris(8-hydroxyquinoline) AlIII (Alq3) complexes allow for control of the emission and electroluminescence from green (526 nm) to the blue region (487 nm), and of the fluorescence quantum yield (0.15-0.57). The compounds used as emitters in OLEDs show a maximum external quantum efficiency (EQE) of 4.6 %, which is among the highest observed for Alq3 complexes. The complexes were used in white-light emitting OLEDs achieving high efficiency (EQE ≈19 %) and high white color purity (CRI≈85).
