Oxidative Radical Transnitrilation of Arylboronic Acids with Trityl Isocyanide

We report a radical transnitrilation of arylboronic acids with trityl isocyanide in the presence of manganese(III) acetate. Many functional groups can be tolerated in this transformation, and a special positive effect of benzoic acid in this reaction has been observed

Tb³⁺, Eu³⁺ Co-doped CsPbBr₃ QDs Glass with Highly Stable and Luminous Adjustable for White LEDs

Herein, we have introduced rare-earth cations Tb³⁺ and Eu³⁺ into CsPbBr₃ QDs glass by conventional melt-quenching. Rare-earth cations like Tb³⁺ emit green light, causing the main peak of bromide lead cesium to exhibit some redshift, owing to the energy transfer between CsPbBr₃ and Tb³⁺. To achieve adjustable light, Eu³⁺ emits red light, which was doped in this glass with different proportions to solve the problem of red deficiency. More importantly, Tb³⁺ and Eu³⁺ co-doped CsPbBr₃ QDs glass shows a series of desirable characteristics due to the energy transfer between Tb³⁺ and Eu³⁺. Interestingly, the blue light radiated by blue chip can excite Tb³⁺, Eu³⁺, and CsPbBr₃ perovskite effectively. We acquired high-performance white light-emitting diodes with color-rendering index, color coordinate transformation, and luminous efficiency of 85.7, 4945 K, and 63.21 lm/W under the current of 20 mA. This acquired Tb³⁺, Eu³⁺ co-doped CsPbBr₃ QDs glass proved the significant feasibility of luminescent materials in solid warm light source

Valence State Control and Third-Order Nonlinear Optical Properties of Copper Embedded in Sodium Borosilicate Glass

The integrated and transparent sodium borosilicate glasses that contain copper exhibiting different colors, that is, red, green, and blue were synthesized by combining the sol–gel process and heat treatment in H₂ gas. To reveal substantially the cause of different colors in the glass, X-ray diffraction (XRD), transmission electron microscopy (TEM) and high resolution TEM (HRTEM) were systematically applied to investigate and determine the microstructure of the doped matter. The results showed three different crystals had formed in the red, green and blue glass, and the sizes of these crystals were range from 9 to 34, 1 to 6, and 1 to 5 nm, respectively. The valence state of copper was further analyzed by X-ray photoelectron spectroscopy (XPS) and electron energy loss spectroscopy (EELS). The third-order nonlinear optical properties of the glasses were investigated by using Z-scan technique at the wavelength of 800 nm. Interestingly, the third-order nonlinear absorption of the red, green, and blue glass can be successfully controlled from reverse saturable absorption, no absorption to saturable absorption and the optical nonlinear susceptibility χ⁽³⁾ of the red, green and blue glass were estimated to be 6.4 × 10^–14, 1.6 × 10^–14, and 2.6 × 10^–14 esu in the single-pulse energy of 0.36 μJ, respectively