Photoluminescence quenching at a <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">p</mi><mi mathvariant="normal">o</mi><mi mathvariant="normal">l</mi><mi mathvariant="normal">y</mi><mi mathvariant="normal">t</mi><mi mathvariant="normal">h</mi><mi mathvariant="normal">i</mi><mi mathvariant="normal">o</mi><mi mathvariant="normal">p</mi><mi mathvariant="normal">h</mi><mi mathvariant="normal">e</mi><mi mathvariant="normal">n</mi><mi mathvariant="normal">e</mi><mo>/</mo><mi mathvariant="normal">C</mi></mrow><mrow><mn>60</mn></mrow></msub></mrow></math></span> heterojunction

M. Theander; A. Yartsev; D. Zigmantas; V. Sundström; W. Mammo; M. R. Andersson; O. Inganäs

doi:10.1103/PhysRevB.61.12957

Photoluminescence quenching at a ${p o l y t h i o p h e n e / C}_{60}$ heterojunction

M. Theander, A. Yartsev, D. Zigmantas, V. Sundström, W. Mammo, M. R. Andersson, and O. Inganäs

Phys. Rev. B 61, 12957 – Published 15 May 2000

Abstract

Quenching of photoluminescence in a substituted polythiophene in the presence of a deposited $C_{60}$ layer is studied by steady-state and time-resolved photoluminescence (PL). The steady-state PL is evaluated by considering the interference of the absorbed and emitted electro-optical field in the thin film coupled to exciton diffusion in the conjugated polymer. PL quenching occurs for excitons generated within 5 nm from the heterojunction. A blueshift of the polymer emission spectrum is observed when $C_{60}$ is deposited on top of a polymer thin film. The blueshift is shown to be caused by PL quenching before the excitation is transferred to the lowest-energy sites.