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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.
A Fourier-transform waveguide spectrometer is demonstrated by using HgTe-quantum-dot-based photoconductors with a spectral response up to a wavelength of 2 μm. The spectral resolution is 50 cm–1. The total active spectrometer volume is below 100 μm × 100 μm × 100 μm.
Researchers show that resonant coupling of light pulses with excitonic transitions affects the optimal time difference between pulses for sum-frequency generation and four-wave mixing in monolayer WSe2.
High-speed, high-resolution optics-based printing typically requires femtosecond pulsed lasers. We demonstrate optical printing using indigo-blue laser diodes and a red continuous-wave laser, achieving a peak printing rate of 7 × 106 voxels s–1 at a voxel volume of 0.55 µm3.
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%.
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.
Organic LEDs based on acceptor–donor–acceptor molecules Y11, IDSe-4Cl and COTIC-4F are shown to be highly effective emitters of short-wave infrared light.
Temporal compression of optical waveforms with compression factors up to 13,000 is demonstrated by exploiting four-wave mixing in a birefringent fibre.
Nitrogen-vacancy centres in surface-engineered diamond are demonstrated to operate as charge-sensitive fluorescent reporters, enabling an optical scheme for voltage recording in physical and biological systems.
Under near-infrared-light excitation, anti-Stokes-shift superfluorescence is observed near 590 nm at room temperature in a medium of lanthanide-doped upconversion nanoparticles. The spectral width and radiative decay lifetime are 2 nm and 46 ns, respectively, in the single-nanoparticle case.
A double-ring-resonator device on thin-film lithium niobate enables the generation of electro-optic frequency combs with a 30% power efficiency and an optical span of 132 nm.
Researchers demonstrated a gate-tunable graphene photodetector with a bandwidth of up to 220 GHz. This was achieved by suppressing the ‘RC’ time constant using a resistive zinc oxide top gate.
Researchers demonstrate efficient frequency conversion with rhombohedral MoS2. A second-harmonic-generation coherence length of ~530 nm at 1,520 nm wavelength and giant nonlinear optical enhancement in waveguide geometries are reported.