No abstract

To promote the development of the solid state lighting and display industry, exploring excellent inorganic phosphors has always been a hot scientific and applied issue. Herein, we have constructed a series of Sm 3+activated La 7 O 6 (BO 3 )(PO 4 ) 2 (abbreviated as LBPO) phosphors by means of the short-time high-temperature solid phase synthesis process. The crystalline phase composition, micromorphology feature, ionic states of elements, and diffuse reflectance absorption performance were solved in detail. LBPO is suitable as phosphor host materials according to the investigation on electronic properties by density functional theory. The excitation and emission performance is significantly influenced by the crystalline structure of the LBPO host and doped Sm 3+ concentration. The optimized photoluminescence strategy is presented: upon the strongest near-ultraviolet (UV) excitation of 404 nm, LBPO:7% Sm 3+ displays intense orange-red visible luminescence with the dominant emission at 605 nm ( 4 G 5/2 → 6 H 7/2 of trivalent samarium). Its concentration quenching mechanism is the dipolar interaction. On the basis of the investigation of the detailed CIE chromaticity coordinate, color purity (CP), correlated color temperature (CCT), and internal quantum efficiency (IQE), we may use LBPO:Sm 3+ micropowder as an alternative ingredient for phosphor-converted near-UV-based warm white LEDs.

No abstract

No abstract

Understanding the dynamic nature of electrochemical interface induced by ion transfer is of great significance. Herein, in situ Raman spectroscopy combined with electrochemistry has been developed to real‐time monitor the transfer of lithium ions at electrode‐electrolyte interface and reveal the associated structure and performance variation of the vanadium pentoxide (V2O5) thin films on the indium tin oxide/silver/aluminum zinc oxide/poly(ethylene terephthalate) (ITO/Ag/AZO/PET) substrates. It is demonstrated that the Raman active/silent states of the vibrational modes of VO, V3O, and VO bonds, as well as the transformation of the V2O5 thin films from V2O5 to lithium vanadate (LixV2O5), can be reversibly changed with reversible extraction/insertion of lithium ions. In situ UV‐vis spectroscopy in combination with in situ Raman analysis is applied to show that the reversible evolutions involving V2O5/LixV2O5 and VO bonding characteristic contribute to the multi‐color electrochromic characteristic of the V2O5 thin films enabling a superior optical modulation of up to 75.41%. This experimental approach establishes a significative guideline for the more elaborate research on the dynamic nature of electrochemical interface.

No abstract

No abstract

No abstract