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Photon Upconversion at Crystalline Organic–Organic Heterojunctions

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Abstract

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Triplet transfer across a surface-anchored metal–organic-framework heterojunction is demonstrated by the observation of triplet–triplet annihilation photon ­upconversion in a sensitizer–emitter heterostructure. Upconversion thresholds under 1 mW cm−2 are achieved. In the broader context, the double-electron-exchange mechanism of triplet transfer indicates that the heterojunction quality is sufficient for electrons to move between layers in this solution-processed crystalline heterostructure.

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