Study Of Structural And Optical Properties Of ZnAlQ_5 (Zinc Aluminum Quinolate) Organic Phosphor For OLED Applications

摘要

The various composition of ZnAlQ_5 such as Zn_(1.5)Al_(0.5)Q_5, Zn_(11)Al_1Q_5, Zn_(0.5)Al_(1.5)Q_5 organic phosphors were prepared via simple cost effective co-precipitation method. The FTIR, SEM, photoluminescence analysis of the prepared phosphors were reported. ZnQ_2 and A1Q_3 were also prepared by similar method and their properties were compared with different composition of ZnAlQ_5. The structural elucidation in the form of stretching frequencies of chemical bonds of the prepared phosphor was carried out using Fourier Transform Infrared Spectroscopy (FTIR). The stretching frequency analysis confirms the formation of prepared phosphor materials. The SEM analysis shows the surface morphological behavior of prepared phosphor materials. Greenish photoluminescence were observed at 505 to 510 nm for the different composition of ZnAlQ_5,in which Zn_(1.5)Al_(0.5)Q_5 shows maximum luminescence intensity at 505 nm. PL emission of ZnQ_2 was observed at 515 nm, while for A1Q_3 at 520 nm. The blue shift of 10 nm was observed in Zb_(1.5)Al_(0.5)Q_5 due to modification of energy level due to presence of Zn~(2+) and Al~(3+). The enhancement in PL intensity was observed in Zn_(1.5)Al_(0.5)Q_5 compared to the other composition due to transfer of energy between Zn~(2+) and quinolate complex. Optical properties of the prepared materials were evaluated for possible applications in organic light emitting devices (OLED).