Down to the wire: Pentacene exhibits crystal-plane-dependent photoluminescence (PL) activity, as demonstrated in highly crystalline 1D wires and 2D disks, which were selectively synthesized using the vaporization-condensation-recrystallization (VCR) process. Although pentacene 1D wires and 2D disks have identical triclinic crystal structures, PL activity is observed only from pentacene 1D wires owing to the presence of "PL-active" (010) planes.
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Park et al. (2012) studied this question.
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