Photoluminescence properties of Dy³⁺ activated Ca₂SiO₄ nanophosphor for WLED applications

Understanding of the Elastic Constants, Energetics, and Bonding in Dicalcium Silicate Using First-Principles Calculations

“…A flat-topped VB is speculated below the Fermi level. The experimental band gap in a series of Dy 3+ -activated Ca 2 SiO 4 phosphors was found to be in the range of 5.10–5.44 eV . From the absorption spectrum of the β-Ca 1.999 Ce 0.0005 Na 0.0005 SiO 4 host material, the band gap energy was estimated to be approximately 7.7 eV .…”

Solvent Evaporation Induced Large-Scale Synthesis of Cs4PbBr6 and CsPbBr3 Microcrystals: Optical Properties and Backlight Application for LEDs

“…It is clear that Cs 4 PbBr 6 is a direct band gap material with its intrinsic band gap ranging from 3.2 to 3.9 eV . But due to the existence of Br vacancy, Cs 4 PbBr 6 portrays two band gaps of (i) ∼2.34 eV associated with the defect state sub band gap and (ii) 3.6 eV attributed to its intrinsic band gap (Figure d) calculated as per Cs 4 PbBr 6 by Kubelka Munk theory. ,, The inset of Figure d shows the sub band gap plot arising due to Br vacancies corresponding to the band gap of 2.34 eV. The calculated values for the band gap were slightly less when compared to the theoretical value of 3.95 eV Cs 4 PbBr 6 . ,, The DRS for the 0D microcrystals are given in Figure e.…”

“…Embedding the perovskite material on polymer matrices , and coating the top layer with epoxy resins has been carried out during practical applications of p-LEDs to prevent damage to perovskite structure when exposed to water and moisture. The era of flexible electronics unfolds a broad spectrum of applications including wearable electronics, flexible displays, − and even submissive energy harvesting devices. , Numerous display technologies have been developed in the field of wearable electronics among which LEDs have taken a major lead as powerful display devices . Research has shown an ardent approach to manufacture scalable electronic devices fabricated directly on flexible substrates.…”

“…Research has shown an ardent approach to manufacture scalable electronic devices fabricated directly on flexible substrates. Concurrently, free-standing polymer films have emerged as flexible substrates in applications such as sensing, micromachining, and consumer electronics which are intended to be cost-effective, thin, easily disposable, and resistant to deformation. , To date, there exist different techniques for creating white light using LEDs including conventional chip-level conversion, usage of mixing chamber and remote optic to integrate a phosphor, quantum dots, perovskites, or any converting materials (dyes and fluorophores) which in turn converts the blue light of a diode into white light . Mixing LEDs of different colors (red, green, and blue) by a method of color mixing is also an efficient way for fabricating white emitting LEDs wherein each LED intensity can be varied accordingly to get a suitable color temperature.…”

P-Doped α-Ca2SiO4 and (Si, P)-Codoped CaO with Special Defect Microstructures and Luminescence due to an Enhanced Solid Solution by a Pulsed Laser Ablation Condensation Route

“…Various doped systems in Ca 2 SiO 4 : {Nd 3+ ; Dy 3+ ; (Ce 3+ , Li + ); Tb 3+ ; Sm 3+ ; Eu 2+ ; Eu 3+ ; (P 5+ , Eu 3+ )} are summarized in Table so as to compare them with our system. In the case of inorganic phosphors, the luminescence wavelength changes according to both the luminescent center ion and its coordination environment at the site occupied in the host crystal.…”