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Here the authors demonstrate the active control of an all-optical switch harnessing the interaction of light with the constituent materials. The response speeds up by two orders of magnitude and scales accordingly with the strength of the light matter interaction.

Field-effect transistors based on semiconductor nanocrystals are promising candidates for low-cost, flexible electronics. This work demonstrates fabrication on flexible substrates and low-voltage operations of integrated circuits based on nanocrystal transistors, including amplifiers and ring oscillators.

Insufficient electron injection remains a limiting factor for the performance of stretchable organic light-emitting diodes. Here designs for both electron transport layer and cathode in stretchable organic light-emitting diodes are reported to achieve efficient electron injection.

Traditional scintillators face challenges in achieving fast response and avoiding afterglow. Guzelturk et al. report colloidal quantum shell heterostructures with bright multiexciton emission, enabling efficient, fast, and robust scintillation for high-resolution and high-speed X-ray imaging.

Developing depolymerizable and recyclable polymers with high light-emitting efficiencies is of vital importance for sustainable photonic technologies, but remains challenging. Here the authors design a strategy to develop such polymers based on the use of controllable cleavable moiety.

Optical nonlinearity in metallic nanostructures has been exploited for all-optical signal switching. Here, Guo et al. report on the optical nonlinearity of indium tin oxide nanorod arrays in the dielectric range induced by pumping in the metallic range, enabling modulation of the full-visible spectrum.

The Kondo effect usually refers to increased electrical resistance in metals due to spin-spin interactions between localized magnetic impurities and conduction electrons. Here the authors report a Kondo-like coupling between a light-induced exciton and localized impurity spins in Nd-doped hybrid perovskite.

Carrier multiplication generates multiple excitons for each absorbed photon but is normally limited by fast phonon-assisted relaxation. Here the authors achieve a threefold enhancement in multiexciton yields in Mn-doped PbSe/CdSe quantum dots, due to very fast spin-exchange interactions between Mn ions and the quantum dots that outpace energy losses arising from phonon emission.

Nanocrystals are desirable light sources for advanced display technologies. Here, the authors report on double-crowned 2D semiconductor nanoplatelets as light downconverters that offer both green and red emissions to achieve a wide color gamut.

We synthesized stretchable electroluminescent polymers capable of reaching a near-unity theoretical quantum yield through thermally activated delayed fluorescence. Their polymers show 125% stretchability with 10% external quantum efficiency and demonstrate a fully stretchable organic light-emitting diode.

It has been challenging to probe whether dynamically disordered organic cations affect optical properties of CH3NH3PbI3. Here, Guo et al. employ infrared-pump electronic-probe spectroscopy and show that pump-induced atomic motions of the organic cations do not substantially alter optoelectronic properties.

Hybrid organic-inorganic perovskites are emerging materials for efficient photovoltaics; however understanding how charge/heat dissipates inside the material remains a challenge. Here, the authors use a spectroscopic approach to observe unusually slow thermal equilibration between the organic and inorganic components.

Substitutional atomic doping is a process by which atomic defects are introduced into a host material, altering its properties; substitutional doping of cadmium selenide or lead selenide nanocrystal lattices with gold nanocrystals has now been achieved, the key being to ensure that the dopant nanocrystals are similar in size to the host nanocrystals.

Lead trihalide perovskites are notable for their excellent optoelectronic properties and uncommon phase behavior. Here, Kirschner et al. show that cesium lead bromide nanocrystals experience a reversible orthorhombic-to-cubic phase transition at moderate excitation fluences and become amorphous at higher fluences.

Multiple infrared lasing and detection technologies exploit intersubband transitions of epitaxial quantum wells, but such transitions are mainly limited to the mid-infrared. Here, the authors report narrow, polarized intersubband transitions up to telecom wavelengths in CdSe colloidal quantum wells.

A bottom-up process to achieve rapid growth of micrometre-sized three-dimensional nanocrystal superlattices during colloidal synthesis at high temperatures is revealed by in situ small-angle X-ray scattering; the process is applicable to several colloidal materials.

Colloidal quantum dots are promising materials for realizing versatile, wavelength-tunable, solution-processed lasers. This Review surveys recent advances in colloidal quantum dot lasing, provides an in-depth analysis of outstanding challenges and discusses a path forward to implementing technologically viable lasing devices.