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These articles were highlighted on the covers of the Advanced Optical Materials July issue:
S. Sriram and co-workers report a new way to control the photoluminescence (PL) response in atomically thin, quasi-2D molybdenum disulphide. High-frequency surface acoustic waves alter the behaviour of charge carriers, interfering with the time lag between photon absorption and light emission. This mechanism is exploited to controllably modulate the PL.
A red fluorescent organic light-emitting device with an unprecedented external quantum efficiency of 10.6% is created by J.-J. Kim and co-workers using an exciplex-forming system as a host for a conventional fluorescent dopant, not showing delayed fluorescence. Quantitative analysis indicates that over 35% of the total excitons are converted to emission light, clearly indicating triplet harvesting in the system.
Cadmium selenide quantum dots (CdSe QDs) have excellent properties such as a bandgap position and visible light absorption in the region required for photoelectrochemical (PEC) hydrogen generation systems. However, the slow reaction rate of holes results in corrosion of the CdSe due to hole accumulation. J.-H. Jang and co-workers describe how graphene quantum dots can provide inexpensive and efficient hole transfer/extraction pathways to improve the stability of the CdSe-sensitized PEC systems.