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Vapoluminescent materials that display reversible and naked eye perceivable colour or luminescence changes have been used as sensors for detection of volatile organic compounds (VOCs) which are toxic air pollutants. This feature article highlights recent advance in finding luminescence vapochromic solidstate materials based on d 6 , d 8 or d 10 metal complexes. It has been demonstrated that vapour-triggered luminescence colour changes are mostly relevant to a variation of weak interactions such as metalsolvent bonds, metallophilic contacts, p-p stacking, hydrogen bonding, host-guest affinity or reversible isomerization etc.

Phototunable biomaterial‐based resistive memory devices and understanding of their underlying switching mechanisms may pave a way toward new paradigm of smart and green electronics. Here, resistive switching behavior of photonic biomemory based on a novel structure of metal anode/carbon dots (CDs)‐silk protein/indium tin oxide is systematically investigated, with Al, Au, and Ag anodes as case studies. The charge trapping/detrapping and metal filaments formation/rupture are observed by in situ Kelvin probe force microscopy investigations and scanning electron microscopy and energy‐dispersive spectroscopy microanalysis, which demonstrates that the resistive switching behavior of Al, Au anode‐based device are related to the space‐charge‐limited‐conduction, while electrochemical metallization is the main mechanism for resistive transitions of Ag anode‐based devices. Incorporation of CDs with light‐adjustable charge trapping capacity is found to be responsible for phototunable resistive switching properties of CDs‐based resistive random access memory by performing the ultraviolet light illumination studies on as‐fabricated devices. The synergistic effect of photovoltaics and photogating can effectively enhance the internal electrical field to reduce the switching voltage. This demonstration provides a practical route for next‐generation biocompatible electronics.

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