【摘 要】
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Exciton quenching dynamics in a polymer PVK doped with FirPic, Ir(piq)2(acac) and Ir(ppy)3 phosphorescent guest materials, respectively, due to the presence of
【机 构】
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Hebei Key Laboratory of Optic-electronic Information Materials, College of Physical Science and Tech
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Exciton quenching dynamics in a polymer PVK doped with FirPic, Ir(piq)2(acac) and Ir(ppy)3 phosphorescent guest materials, respectively, due to the presence of metal films is analyzed using time-resolved photoluminescence.The quenching is directly goveed by radiationless energy transfer to the metal and is further enhanced by diffusion of excitons into the depletion region of the exciton population at the polymer/metal interface.The influence of polymer layer thickness on the luminescence decay is described by a one-dimensional diffusion model.The energy transfer distance and exciton diffusion length are 10nm, 9nm, 15nm and 29.3nm, 30.1 run, 30.9nm for PVK doped with phosphorescent guest materials FirPic, Ir(piq)2(acac) and Ir(ppy)3, respectively.This can disentangle the contributions from direct energy transfer to the metal and exciton migration to the exciton quenching process.The lengths of the exciton quenching region of the three doping systems are 39.3 nm, 39.1 nm and 45.9nm, respectively.
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