Volume 16 Issue 12, December 2022

Suppression of exciton–vibration coupling yields organic light-emitting diodes that emit at 1,000 nm in the NIR-II spectral region, which is important for biological imaging.

Experimental confirmation that the Gouy phase can modify the photonic de Broglie wavelength opens up many exciting directions in metrology using quantum systems with higher-order Gaussian modes.

The free-carrier dispersion effect with photo-excited free carriers provides all-optical control of the resonance of photonic crystal microcavities. Using this technique, a spatial light modulator comprising optically addressed cavity arrays has been developed for high-efficiency, high-bandwidth spatiotemporal modulation of light.

Temporal compression of optical waveforms with compression factors up to 13,000 is demonstrated by exploiting four-wave mixing in a birefringent fibre.

A single beamline interferometer with different two-photon N00N states is implemented through spatial tailoring of photon pairs. It enables the observation of the speed-up of the quantum Gouy phase — the phase acquired by the N-photon number state of paraxial modes upon propagation.

Panuski et al. demonstrate a programmable photonic crystal cavity array, enabling the spatiotemporal control of a 64 resonator, two-dimensional spatial light modulator with nanosecond- and femtojoule-order switching.

A new series of self-assembled Pt(II) complexes with high emission quantum yields enables OLEDs with a maximum emission wavelength of 995 nm and an external quantum efficiency of 4.3%.

The accurate identification of the three-dimensional quantitative shape of a cell nucleus is now possible without fluorescent staining by applying computational segmentation to refractive index tomograms recorded in the flow cytometry mode.

It is shown that CsPbBr₃ nanocrystals exhibit good radiation hardness for high γ-radiation doses, as high as 1 MGy. Electron trapping in surface defects limits scintillator applications, but is shown to be suppressed by surface fluorination treatment.

Heavy atoms like Cl, Br and I introduced into thermally activated delayed fluorescence chromophores can increase the X-ray absorption cross-section. Light yield of ~20,000 photons MeV^–1, detection limit of 45.5 nGy s⁻¹ and imaging resolution of >18.0 line pairs per millimetre is demonstrated.

One-micrometre-thick OLEDs with low operating voltages of 5.11 V, 3.55 V and 6.88 V at 1,000 cd cm^–2 for red, green and blue devices, respectively, and long lifetimes (55,000 h, 18,000 h and 1,600 h, respectively) are realized.