Using a wet chemical process, a continuous network of silver nanowires was buried at the surface of a transparent polymer (PVA) to form a flexible transparent conductor, which shows high optical transparency, low sheet resistance, a smooth surface, and superior mechanical, thermal and chemical stabilities. The composite is a competitive choice for transparent electrodes in OLED and thin film solar cells.

A new series of strongly greenish-blue to blue emitting Cu(NN)(POP) + (POP = bis[2-(dipenylphosphino)phenyl]ether) complexes containing N-linked 2-pyridyl pyrazolate diimine ligands [Cu(pypz)(POP)]BF 4 (1), [Cu(pympz)(POP)]BF 4 (2), and [Cu(pytfmpz)-(POP)]BF 4 (3) (pypz = 1-(2-pyridyl)pyrazole, pympz = 3-methyl-1-(2-pyridyl)pyrazole, and pytfmpz = 3-trifluoromethyl-1-(2-pyridyl)pyrazole) have been designed and synthesized. Their structural, electrochemical, and photophysical properties have been characterized. The complexes 1−3 exhibit high photoluminescence quantum yields (PLQYs) at room temperature both in nitrogen-saturated CH 2 Cl 2 (up to 45%) and in neat solid (up to 87%), which are comparable to the reported highest values for the cuprous complexes. The temperature dependence of spectroscopic properties and emission decay behaviors reveal the presence of two thermally equilibrated emitting states. At temperatures below 150 K, the lowest triplet state (T 1 ) is the predominant emitting state resulting in the typical phosphorescence with the emission decay times in the order of hundreds of microseconds. However, at ambient temperature, the lowest singlet state (S 1 ), which lies only about 0.17−0.18 eV above the T 1 state, is populated thermally and in turn generates efficient thermally activated delayed fluorescence (TADF), and the emission decay times are reduced dramatically to, e.g., 12.2 μs for 2. Solution-processed OLEDs containing 1−3 in the emissive layer demonstrated excellent device performances by taking advantage of the singlet harvesting mechanism, among which the electroluminescent device using 3 shows a peak external quantum efficiency (EQE) of 8.47%, a peak current efficiency (CE) of 23.68 cd/A, and a maximum brightness of 2033 cd/m 2 .

A simple, instrument-free, paper-based analytical device with dual-emission carbon dots (CDs) (blue CDs and red CDs) was developed for the semiquantitative, visual, and sensitive speciation analysis of lead ions in a real sample with a sensitive detection limit of 2.89 nM. When a paper strip was immersed into the sample solution, the blue fluorescence was quenched by Pb 2+ in solution, while the red fluorescence served as a background reference without color change, and significant color evolutions from blue to red were observed under the ultraviolet lamp, resulting in a semiquantitative visual detection. Furthermore, a smartphone was used in the visual detection of lead ions by identifying the RGB value of the fluorescent probe solution and corresponding paper strip. The application of smartphones and fluorescent paper strips has greatly shortened the detection time and reduced the cost of detection, providing a new strategy for the on-site and semiquantitative detection of heavy-metal ions in water samples.