Red electroluminescence and photoluminescence properties of a reduced porphyrin compound, tetraphenylchlorin

We report red PL and EL properties of a reduced porphyrin, tetraphenylchlor in (TPC). In monomer solution TPC emitted a red PL band at 655 nm, In solid mono-film TPC emitted a red PL band at 660 nm but it also emitted two far- rad PL bands at 725 and 750 nm due to aggregated emission sites in the film . EL devices in which TPC were doped at concentrations of 1.6-3.7 wt.% with in an Alq(3) host layer showed red EL color due to a 660-nm emission of TPC monomer with a width of 20 nm. The red-emitting devices using alpha-NPD as a hole-transport layer had maximum luminance higher than those using TPD d id. Among the red devices, we obtained a maximum luminance of 520 cd/m(2) w ith chromaticity coordinates of x = 0.620 and y = 0.31. (C) 2000 Elsevier S cience S.A, All rights reserved.