Elucidating the structure and optimising the photoluminescence properties of Sr2Al3O6F: Eu3+ oxyfluorides for cool white-LEDs

In situ fabrication of porous biochar reinforced W18O49 nanocomposite for methylene blue photodegradation

“…For CDAC showed significant absorption within the full spectrum. 40 The pristine W 18 O 49 nanowires have a primary absorption edge of 440 nm and an absorption region ranging from 440 to 1100 nm, showing strong responsiveness throughout the visible region and near-infrared light range. This unique light absorption ability originates from the metal-like LSPR effect of the W 18 O 49 nanowires due to the presence of abundant oxygen vacancies.…”

Energy Upconversion in Rare‐Earth‐Doped Tin‐Based Double Halo Perovskites, A2SnCl6 (A = K, Rb, and Cs)

“…The magnetic dipole radiative emission rate A 0–1 is 50 s –1 . The electric dipole radiative emission rates A 0–2, 4, can be described as a function of the J–O intensity parameters as per the expression: [ 30 ] where χ is the Lorentz local field correction factor and related with the index of refraction “n” of the host using . The non‐zero square reduced matrix elements are taken as = 0.0032 and = 0.0023.…”

“…The values of Ω 2 and Ω 4 are calculated using these values and tabulated in Table 1 and Table 2. With the help of the estimated J–O parameters, essential radiative properties such as radiative transition probabilities (A rad ), total radiative transition probability (A T ), radiative lifetime τ rad (ψ J ), and the branching ratios β (ψ J ) of the excited states of Eu 3+ and Tb 3+ ions are arrived using the following expressions: [ 30 ] …”

“…The magnetic dipole radiative emission rate A 0-1 is 50 s -1 . The electric dipole radiative emission rates A 0-2, 4, can be described as a function of the J-O intensity parameters as per the expression: [30] where is the Lorentz local field correction factor and related with the index of refraction "n" of the host using The non-zero square reduced matrix elements are taken as = 0.0032 and = 0.0023. The values of Ω 2 and Ω 4 are calculated using these values and tabulated in Table 1 and Table 2.…”

“…Calculated value of J-O parameter, radiative parameters (transition rate (A R , A NR, and A T ), lifetime value of (τ obs and τ rad ), quantum efficiency (η) and branching ratio ( 01 , 02 and 04 )) of Eu 3+ doped A 2 SnCl 6 samples. ity (A T ), radiative lifetime τ rad (ψ J ), and the branching ratios (ψ J ) of the excited states of Eu 3+ and Tb 3+ ions are arrived using the following expressions: [30] The quantum efficiency (η) is another essential parameter and expressed as the ratio of an experimentally determined lifetime and radiative lifetime as per the following equation: [31] The radiative properties of Eu 3+ and Tb 3+ doped A 2 SnCl 6 samples are very high, suggesting their potentiality in optical devices operating at room temperature (Tables 1 and 2).…”