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• W1966895918 abstract "We investigate quenching processes which contribute to the roll-off in quantum efficiency of phosphorescent organic light-emitting diodes (OLED's) at high brightness: triplet-triplet annihilation, energy transfer to charged molecules (polarons), and dissociation of excitons into free charge carriers. The investigated OLED's comprise a host-guest system as emission layer within a state-of-the-art OLED structure---i.e., a five-layer device including doped transport and thin charge carrier and exciton blocking layers. In a red phosphorescent device, $N,{N}^{ensuremath{'}}$-di(naphthalen-2-yl)- $N,{N}^{ensuremath{'}}$-diphenyl-benzidine is used as matrix and tris(1-phenylisoquinoline) iridium $[mathrm{Ir}(mathrm{piq}{)}_{3}]$ as emitter molecule. This structure is compared to a green phosphorescent OLED with a host-guest system comprising the matrix 4,${4}^{ensuremath{'}}$,${4}^{ensuremath{''}}$-tris ($N$-carbazolyl)-triphenylamine and the well-known triplet emitter fac-tris(2-phenylpyridine) iridium $[mathrm{Ir}(mathrm{ppy}{)}_{3}]$. The triplet-triplet annihilation is characterized by the rate constant ${k}_{TT}$ which is determined by time-resolved photoluminescence experiments. To investigate triplet-polaron quenching, unipolar devices were prepared. A certain exciton density, created by continuous-wave illumination, is analyzed as a function of current density flowing through the device. This delivers the corresponding rate constant ${k}_{P}$. Field-induced quenching is not observed under typical OLED operation conditions. The experimental data are implemented in an analytical model taking in account both triplet-triplet annihilation and triplet-polaron quenching. It shows that both processes strongly influence the OLED performance. Compared to the red $mathrm{Ir}(mathrm{piq}{)}_{3}$ OLED, the green $mathrm{Ir}(mathrm{ppy}{)}_{3}$ device shows a stronger efficiency roll-off which is mainly due to a longer phosphorescent lifetime $ensuremath{tau}$ and a thinner exciton formation zone $w$." @default.
• W1966895918 created "2016-06-24" @default.
• W1966895918 creator A5012305133 @default.
• W1966895918 creator A5016682273 @default.
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• W1966895918 date "2007-03-28" @default.
• W1966895918 modified "2023-10-10" @default.
• W1966895918 title "Triplet-exciton quenching in organic phosphorescent light-emitting diodes with Ir-based emitters" @default.
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• W1966895918 doi "https://doi.org/10.1103/physrevb.75.125328" @default.
• W1966895918 hasPublicationYear "2007" @default.
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