Crystal structure engineering and optical analysis of novel greenish Sr9Al6O18:Er3+ nanomaterials for NUV excitable cool-white LED applications

An Er3+ doped Ba2MgWO6 double perovskite: a phosphor for low-temperature thermometry

“…The studied sample exhibits cool light having a high CCT value of 6833 K. Similarly, the values found in YAG:Er 3+ (7246 K), 43 Sr 9 Al 6 O 18 :Er 3+ (6748 K), 45 and LiLaMgWO 6 :Er 3+ (6827 K) 39 indicate cool light whereas Ba 2 CaWO 6 :Er 3+ (4896 K) 54 possesses warm light. For the above reason, it is worth studying further the sample doped with 0.5%Er 3+ in terms of white-light application.…”

“…In particular, the CIE coordinates of BMW:0.5%Er 3+ were found to be (0.30, 0.35), which appears close to the ideal white-light (0.33, 0.33) (marked as a white star). As compared to the CIE of other Er 3+ -activated phosphors, for instance YAG:Er 3+ (0.24, 0.51), 43 Sr 9 Al 6 O 18 :Er 3+ (0.29, 0.46), 45 ZnO:Er 3+ (0.35, 0.43), 44 NaLaMgWO 6 :Er 3+ (0.23, 0.60), 57 LiLaMgWO 6 :Er 3+ (0.27, 0.67), 39 and Ba 2 CaWO 6 (0.37, 0.57), 54 this result seems to be a good approach to the ideal white-light.…”

“…Since the typical luminescence of Er 3+ is more suitable for a green phosphor, the white light must be obtained by combining the green emission of erbium with the red and blue emission of the diode, another phosphor, or another dopant. However, few attempts to obtain a light with the Commission Internationale de l'Eclairclage (CIE) chromaticity coordinates close to the white-light using solely Er 3+ have been made including YAG:Er 3+ with CIE (0.240, 0.514), 43 ZnO:Er 3+ (0.35, 0.43), 44 Sr 9 Al 6 O 18 :Er 3+ (0.286, 0.464) 45 and Gd 2 O 3 :Yb,Er (0.252, 0.432) 46 in which Yb 3+ ions were used as a sensitizer only. The correlated colour temperatures reported for YAG:Er 3+ and Sr 9 Al 6 O 18 :Er 3+ were 7246 K and 6748 K, respectively.…”

Optical, crystallographic and Judd–Ofelt analysis of europium doped Sr6Y2Al4O15 nanocrystals for NUV-WLED fabrication

“…The quantum efficiency decreases with an increase in activator ions concentration because the observed lifetime decreases due to non-radiative energy transfer among activator ions [36]and is found to be 75% for the optimized sample. were evaluated via Kubelka-Munk formulation [37] giving a plot between photon energy and absorption coefficient (a) [Fig.…”

Self-Assembly of Hausmannite Mn3O4 Triangular Structures on Cocosin Protein Scaffolds for High Energy Density Symmetric Supercapacitor Application

“…Investigation on nanoscale materials has received much interest worldwide owing to their unique structural properties. In-depth interdisciplinary research endeavors led to the fabrication of different potential materials for various applications. , Metals, semiconductors, and oxide materials at the nanometer-sized geometrical forms display desired optical, electrical, and mechanical features suitable for applications such as varistors, solar cells, catalysis, light-emitting diodes, energy devices, and sensors . This demands new synthetic approaches for preparing size- and shape-selective nanostructures with time and cost-effectiveness.…”