Writing and Erasing Encryption Information Based on Frustrated Lewis Pair Chemistry

Lewis acid–base adducts resulting from instantaneous interactions provide a cost-effective strategy for color tuning and anticounterfeiting information. Herein, we report the construction of luminescent Lewis acid–base adducts via inkjet printing. Due to the unique weak coordination bond of B→N, it is feasible to construct anticounterfeiting information that is easy to erase. The in situ postsynthesis of the luminescent quick response codes via inkjet printing facilitates precision chemistry control to change the emission ranging from deep-blue (peaking at 407 nm) to orange-red (peaking at 597 nm). The encrypted information can be quickly erased either by modulating the temperature to dissociate the weak coordination or strong Lewis base to promote a neutralization reaction

Tailoring Spatial Distribution of the Optical Field Intensity in Semitransparent Inverted Organic Solar Cells

A WO3/Ag/WO3 multilayer structure was introduced as a transparent top anode in semitransparent inverted organic solar cells. The inner WO3 film served as a hole extraction layer, while the outer WO3 film acted as a light coupling layer to enhance optical transmittance of the devices. The dependence of device performances on the thickness of the outer WO3 capping layer was investigated. Experimental results showed that both optical and electrical properties of the devices with WO3/Ag/WO3 as a transparent top anode could be tailored by varying the thickness of the outer WO3 capping layer. The spatial distribution of the optical field and the exciton generation rate across the active layer were calculated to discuss the effect of the thickness of the outer WO3 capping layer on the photocurrent

Prognostic Value of Circulating Tumor Cells in Ovarian Cancer: A Meta-Analysis

<div><p>Background</p><p>The prognostic value of circulating tumor cells (CTCs) in ovarian cancer has been investigated in previous studies, but the results are controversial. Therefore we performed a meta-analysis to systematically review these data and evaluate the value of CTCs in ovarian cancer.</p><p>Materials and Methods</p><p>A literary search for relevant studies was performed on Embase, Medline and Web of Science databases. Then pooled hazard ratios (HRs) for survival with 95% confidence intervals (CIs), subgroup analyses, sensitivity analyses, meta-regression analyses and publication bias were conducted.</p><p>Results</p><p>This meta-analysis is based on 11 publications and comprises a total of 1129 patients. The prognostic value of the CTC status was significant in overall survival (OS) (HR, 1.61;95% CI,1.22–2.13) and progression-free survival (PFS)/disease-free survival (DFS) (HR, 1.44; 95%CI, 1.18–1.75). Furthermore, subgroup analysis revealed that the value of CTC status in OS was significant in "RT-PCR" subgroup (HR, 2.02; 95% CI, 1.34–3.03), whereas it was not significant in "CellSearch" subgroup (HR, 1.15; 95% CI 0.45–2.92) and "other ICC" subgroup (HR, 1.09; 95% CI 0.62–1.90). The presence of CTC was also associated with an increased CA-125 (OR, 4.07; 95%CI, 1.87–8.85).</p><p>Conclusion</p><p>Our study demonstrates that CTC status is associated with OS and PFS/DFS in ovarian cancer.</p></div

Forest plot showing the meta-analysis of hazard ratio estimates for OS in overall patients.

<p>OS = overall survival.</p

Begg’s funnel plots of the prognostic role of CTCs in OS.

<p>CTCs = circulating tumor cells; OS = overall survival.</p

Main characteristics of the eligible studies.

<p>^aTumor stage and percentage of advanced stage(%); NR, Not Reported; CTCs, circulating tumor cells; ICC, immunocytochemistry; RT-PCR, reverse-transcriptase polymerase chain reaction.</p><p>Main characteristics of the eligible studies.</p

Forest plots of the association between CTCs and CA-125.

<p>CTCs = circulating tumor cells.</p

Tetraphenylcyclopentadiene-Based Hyperbranched Polymers: Convenient Syntheses from One Pot “A₄ + B₂” Polymerization and High External Quantum Yields up to 9.74% in OLED Devices

Through the A4 + B2 type Suzuki–Miyaura coupling reaction, hyperbranched polymers CP1, CP2, and CP3 were easily prepared, which exhibited high luminous efficiency in solution, neat film, and solid state as well as good thermal stability. When fabricated into organic light-emitting diodes (OLEDs) with mCP as host, the device based on CP1 demonstrated the good EL performance with external quantum efficiency (EQE) up to 6.36%. While the bipolar TADF host of CzAcSF was utilized instead of mCP, the driving voltage (at luminescence of 10 cd m–2) decreased from 5.7 to 4.4 V, and the EQE further increased to 9.74%, which was the highest EQE reported for hyperbranched polymers

Forest plot showing the meta-analysis of hazard ratio estimates for OS in “Surgery” subgroup and “Chemotherapy” subgroup.

<p>Subgroup analysis based on different treatment methods. OS = overall survival.</p

Enhancing Optical Gain Stability for a Deep-Blue Emitter Enabled by a Low-Loss Transparent Matrix

Efficient organic gain media with high optical gain and good photostability are highly desirable for organic semiconductor lasers. To shed light on the rational molecular design, in this work, a novel deep-blue organic emitter consisting of a carbazole core substituted by a diphenylamine-functionalized triazine unit and two arms of bifluorene with flexible alkyl chains (denoted as C2) was designed and synthesized. Various basic photophysics and amplified spontaneous emission (ASE) characterizations were conducted with a particular focus to unravel the impact of the molecular structure on the photostability. Relatively low ASE threshold of 7.0 μJ/cm2, high net gain coefficient of 79.9 cm–1 (under 40-fold threshold pump fluence), and low optical loss coefficient of 7.0 cm–1 were recorded for C2 in neat films. For comparison, C2 was also dispersed into polystyrene (PS), a low-loss transparent matrix, with various ratios to form PS-C2 blend films. Among them, a 50 wt % PS-C2 blend film exhibited a high gain coefficient of 61.8 cm–1 and a low-loss coefficient of 5.4 cm–1, manifesting enhanced gain properties in comparison with that of pure C2 sample (52.2 and 7.0 cm–1) under identical pump conditions (10-fold threshold pump fluence). With simple high-ratio blending, the photostability and the film morphology stability under annealing conditions were found to be significantly enhanced, giving rise to highly stable optical gain properties. The optical gain properties of the PS-C2 blend films remained almost unchanged even upon harsh annealing treatment in ambient atmosphere. The results suggest an efficient strategy to enhance the photostability of organic gain media without sacrificing the optical gain properties by combining the merits of robust gain media and a low-loss transparent matrix for achieving efficient and stable organic semiconductor lasers