Abstract
The cover picture shows poly(laddertype pentaphenylene) hosts end‐capped with palladium tetratolylporphyrin guest moieties. After absorption of photons (green arrows) in the singlet Q‐band of the porphyrin molecule, due to effective intersystem crossing, the porphyrin's long‐lived triplet state is populated. In their Communication on page 1250 Baluschev et al. consider the excited triplet states as a reservoir of excited states for the subsequent energy transfer (grey arrows) leading to up‐conversion photoluminescence (blue arrow) of the host molecules. Phosphorescence emission of the guest molecules is also observed (red arrow).
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