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(a) Electroluminescence spectra of a device with an emission layer of Pt(TPBP) in at current densities of (dashed line) and (solid line). Inset: the molecular structural formula of Pt(TPBP). (b) External quantum efficiency vs current density. Inset: schematic of the device structure.
Room temperature transient photoluminescence decays for a dilute solution of Pt(TPBP) in 2MeTHF at (dashed line), and thin films of Pt(TPBP) in (squares) and Pt(TPBP) in CBP (dotted line). The solid lines are fits using the triplet-triplet annihilation model described in text. Transient electroluminescence decay (circles) for the device in Fig. 1 is plotted for comparison.
(a) Roll-offs of the external quantum efficiencies for the device presented in Fig. 1 (squares) and an ITO/NPD Pt(TPBP):CBP OLED (circles) fit (solid lines) using the triplet-triplet annihilation model described in text. (b) Roll-off of the external quantum efficiency for an ITO/NPD PQIr:CBP OLED (triangles) and the calculated efficiencies (solid line) using the triplet-triplet annihilation model described in text. Inset: the roll-off of the external quantum efficiency for the same device as a function of the external electric field (triangles) is fit (solid line) using the field-induced charge pair dissociation model described in text.
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