Modulation of transport properties S/Br substitution: solvothermal synthesis, crystal structure, and transport properties of BiSBr.

The solvothermal synthetic exploration of the Bi-S-halogen phase space resulted in the synthesis of two bismuth sulfohalides with common structural motifs. BiSI was confirmed to have the previously reported composition and crystal structure. In contrast, the bromide analogue was shown to have a formula of neither BiSBr nor BiSBr, in contrast to the previous reports.

Ratiometric Thermometry Using Thermochromic Tb:Mn:NaMg(WO) Phosphors.

The utility of Tb:Mn:NaMg(WO) phosphors as ratiometric luminescent thermometers in the 200-450 K temperature range is demonstrated. Targeted substitution of Tb for Na and Mn for Mg yields phosphors of formula NaTbMgMn(WO). UV excitation of the NaMg(WO) host results in green emission from terbium (544 nm) and red emission from manganese (682 nm).

n-Type PbSe Quantum Dots via Post-Synthetic Indium Doping.

We developed a postsynthetic treatment to produce impurity n-type doped PbSe QDs with In as the substitutional dopant. Increasing the incorporated In content is accompanied by a gradual bleaching of the interband first-exciton transition and concurrently the appearance of a size-dependent, intraband absorption, suggesting the controlled introduction of delocalized electrons into the QD band edge states under equilibrium conditions. We compare the optical properties of our In-doped PbSe QDs to cobaltocene treated QDs, where the n-type dopant arises from remote reduction of the PbSe QDs and observe similar behavior.