Publisher Correction: Tunable long persistent luminescence in the second near-infrared window via crystal field control.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.

Tunable long persistent luminescence in the second near-infrared window via crystal field control.

Construction of an active composite as a biomarker with deeper tissue penetration and higher signal-to-noise ratio (SNR) is of great importance for the application in bioimaging. Here, we report a strategy for tuning the emission bandwidth and intensity via crystal field control in long persistent phosphors (LPPs). Ni-doped ZnSnGaO phosphors, with a tunable emission band peaking from 1270 to 1430 nm in the second near-infrared (NIR) window, have been successfully prepared.

A strategy for fabrication of controllable 3D pattern containing clusters and nanoparticles inside a solid material.

Directly controlling the growth process of clusters and nanoparticles is an effective way to tune their specific properties, which has been considered as a significant issue lying at the heart of nanotechnology. For technological applications, great strides have been made in the assembly of clusters and nanoparticles. However, controllable synthesis of clusters and nanoparticles inside a bulk solid-state medium remains a tremendous challenge, which is important for integrated devices.

Enhanced nonlinear optical response of Se-doped MoS nanosheets for passively Q-switched fiber laser application.

An enhanced nonlinear optical (NLO) performance was observed in Se-doped MoS nanosheets synthesized through a facile annealing process. Se-doped MoS nanosheets with a large saturable intensity and high modulation depth generated stable passively Q-switched fiber laser pulses at 1559 nm. In comparison with the Q-switched fiber laser utilizing the pristine MoS nanosheets as a saturable absorber, the passive Q-switching operation based on Se-doped MoS nanosheets could be conducted at a lower threshold power of 50 mW, a wider range of repetition rates from 28.

Controllable optical modulation of blue/green up-conversion fluorescence from Tm (Er) single-doped glass ceramics upon two-step excitation of two-wavelengths.

Optical modulation is a crucial operation in photonics for network data processing with the aim to overcome information bottleneck in terms of speed, energy consumption, dispersion and cross-talking from conventional electronic interconnection approach. However, due to the weak interactions between photons, a facile physical approach is required to efficiently manipulate photon-photon interactions. Herein, we demonstrate that transparent glass ceramics containing LaF: Tm (Er) nanocrystals can enable fast-slow optical modulation of blue/green up-conversion fluorescence upon two-step excitation of two-wavelengths at telecom windows (0.

Vertically standing layered MoS nanosheets on TiO nanofibers for enhanced nonlinear optical property.

Vertical layered MoS nanosheets rooting into TiO nanofibers were successfully prepared by a facile two-step method: prefabrication of porous TiO nanofibers based on an electrospinning technique, and assembly of MoS ultrathin nanosheets through a simple hydrothermal reaction. Significant enhancement of nonlinear optical response of the MoS/TiO nanocomposite was confirmed by an open-aperture z-scan measurement. The nanocomposite displayed strong optical limiting (OL) effects to ultrafast laser pulses with a low OL threshold of ~22.

Evolution of polarization dependent microstructures induced by high repetition rate femtosecond laser irradiation in glass.

We report the observation of an anomalous polarization dependent process in an isotropic glass induced by long time stationary irradiation of a high repetition rate near-infrared femtosecond laser. Two distinctive types of polarization dependent microstructures were induced at different irradiation stages. At early stage (a few seconds), a dumbbell-shaped structure elongated perpendicularly to the laser polarization formed at the top of the modified region, which was later erased by further irradiation.

Terpenoids from roots of Chloranthus henryi.

Six new terpenoids, including three diterpenoids (1-3), one norditerpenoid (4) and two sesquiterpenoids (11 and 12), were isolated from the roots of Chloranthus henryi. The structures were elucidated mainly by 1D, and 2D NMR and MS experiments, and their relative configurations were determined by NOE techniques.

Dammarane-type glycosides from Gynostemma pubescens.

Triterpene saponins 1-8 were isolated from the aerial parts of Gynostemma pubescens. Among them, compounds 1-4, 8 possess carboxylic groups at both C-21 and C-29, 5 contains a carboxylic group at C-21 and an aldehyde function at C-29, whereas 6 and 7 contain carboxylic groups at C-21 and hydroxymethylene groups at C-29. Their structural elucidation was accomplished by extensive spectroscopic methods including application of 1D (1H, (13)C, (13)C DEPT) and 2D NMR experiments (HMQC, HMBC, HSQC), HRESIMS analysis, as well as by chemical degradation.