A continuum of intermediate states (current levels) is demonstrated for an organic diode utilizing a photochromic (dithienylethene) switching layer. Specific intermediate states can be attained by controlling the fraction of closed isomer (X) in the transduction layer, affording a novel methodology for multilevel storage applications. The analog response of the device is discussed in terms of the concentration and morphology of closed dithienylethene isomer, which can be accessed via optical and electrical switching reactions.

Photochromic molecules provide an intriguing and relatively untapped alternative to traditional materials utilized in organic memory devices. Here, we review recent progress in the implementation of photochromic molecules in electrically-addressed organic memory devices. Recent results for a lightemitting photochromic organic diode are highlighted in the context of multifunctional devices with the ability to simultaneously operate as multilevel memory, signage and display elements. Furthermore, a set of design rules for successful implementation of photochromic compounds in organic memory devices are suggested.

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Photochromic molecules provide an intriguing and relatively untapped alternative to traditional materials utilized in organic memory devices. , Klaus Meerholz and co‐workers review the use of photochromic materials, with an emphasis on dithienylethenes, in electrically‐addressed organic electronic devices. Recent results for a multifunctional, light‐emitting organic memory device incorporating a photochromic transduction layer are discussed in terms of applications in signage and multilevel memory arrays.