1.54 μm Near-infrared photoluminescent and electroluminescent properties of a new Erbium (Ⅲ) organic complex

摘要

The crystal structure of Er(PM)_3(TP)_2 [PM = 1-phenyl-3-methyl-4-isobutyryl-5-pyrazolone, TP = triphenyl phosphine oxide] was reported and its photoluminescence properties were studied by UV-vis absorption, excited, and emission spectra. The Judd-ofelt theory was introduced to calculate the radiative transition rate and the radiative decay time of 3.65 ms for the ~4I_(13/2)→~4I_(15/2) transition of Er~(3+) ion in this complex. The antenna-effect and phonon-assisted energy-transfer were introduced to discuss the intramolecular energy transfer from ligands to Er~(3+) ion. Based on this Er(III) complex as the emitter, the multilayer phosphorescent organic light emitting diode was fabricated with the structure of ITO/NPB 20 nm/Er(PM)_3(TP)_2 50 nm/BCP 20 nm/AlQ 40 nm/LiF 1 nm/Al 120 nm, which shows the typical 1.54 μm near-infrared (NIR) emission from Er~(3+) ion with the maximum NIR irradiance of 0.21 μW/cm~2.