The influence of synthesis conditions on the stability of tris(8-hydroxyquinoline) aluminum organometallic luminophore

Abstract

Single-phase crystalline luminophore tris(8-hydroxyquinoline) aluminum (Alq₃) has been synthesized at Т = 483 K and a partial pressure of 8-hydroxyquinoline vapor from 0.15 to 6.12 Torr. The influence of P_8-Hq on the luminescent characteristics of crystalline Alq₃ samples has been studied. It has been found that an increase in P_8-Hq led to a shift of the photoluminescence-band maximum and to a change in the photoluminescence-decay kinetics. It has been shown that Alq₃ synthesized at Т = 483 K and P_8-Hq = 6.12 Torr had the most stable spectral-luminescent characteristics. The results obtained are discussed taking into account defect formation in crystalline Alq₃.