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Efficient Exciton Quenching by Hole Polarons in the Conjugated Polymer MEH‐PPV
Author(s) -
Yu Ji,
Song Nam Woong,
Mcneill Jason D.,
Barbara Paul F.
Publication year - 2004
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/phge-rr3p-5p7v-dgcm
Subject(s) - photoluminescence , polaron , exciton , quenching (fluorescence) , chemistry , optoelectronics , charge carrier , conjugated system , polymer , photochemistry , condensed matter physics , chemical physics , materials science , optics , physics , fluorescence , organic chemistry , quantum mechanics , electron
Recently published near field scanning optical measurements (NSOM) on the conjugated polymer MEH‐PPV exhibited a strong dependence of the photoluminescence intensity on the applied electric fields at the NSOM tip. The observed effect is apparently due to exciton quenching by hole polarons. In the present paper, a model “single carrier” electro‐modulated‐photoluminescence device is used to further explore the exciton quenching effect of hole polarons in MEH‐PPV. Hole polarons, created by charge injection from an ITO electrode, are observed to dramatically quench the photoluminescence intensity of MEH‐PPV. The Stern‐Volmer quenching efficiency of a hole polaron in conjugated polymer thin films was measured to be 390 nm 3 . This value, and other data presented herein, are consistent with the published NSOM photoluminescence modulation measurements and offer further evidence that hole polarons are efficient photoluminescence quenchers in MEH‐PPV.