Energy transfer mechanism of KAlF4:Dy3+, Eu3+ co-activated down-conversion phosphor as spectral converters: An approach towards improving photovoltaic efficiency by downshifting layer

Color-tunable luminescence, energy transfer behavior and I–V characteristics of Dy3+,Eu3+ co-doped La(PO4) phosphors for WLEDs and solar applications

“…Whereas, if the value of R c is less than 5 Å, an exchange interaction is responsible for the concentration quenching. 29 In this investigation, the value of V = 303.938, X c = 1 mol% (0.01) and N = 4. Using eqn (1), the calculated value of R c is around 24.38 Å.…”

Luminescence study of Sm3+,Eu3+‐doped Y2Zr2O7 host: optical investigation of greenish yellow to red colour tunable pyrochlore phosphor

“…The energy transfer efficiency from Sm 3+ to Eu 3+ was determined by formula [ 51 ] : where I S is luminescence intensity of Sm 3+ co‐doped with Eu 3+ and I S0 is the luminescence intensities of Sm 3+ without co‐doping of Eu 3+ . The η T from Sm 3+ to Eu 3+ in YZO phosphors is given as a function of the Eu 3+ concentration, as displayed in Figure 13(b).…”

“…However, the colour purity of the phosphors was enhanced with respect to the Eu 3+ concentration. Colour purity of the proposed phosphor was calculated using the formula [ 51–53 ] : where, (x, y) and (x i , y i ) are the colour coordinates of the sample point and CIE equal‐energy illuminant, respectively; (x d , y d ) are the chromaticity coordinates of the dominant wavelength of the light source.…”

A crystal defect led zero thermal quenching β-NaYF4 : Eu3+,Dy3+ red emitting phosphor

“…The energy transfer between Dy 3+ and Eu 3+ could occur due to the higher energy level of the 4 F 9/2 of the Dy 3+ ion compared to the 5 D 0 and 5 D 1 of the Eu 3+ ion. [34][35][36] The existence of Dy 3+ leads to an improvement of the red-light emitting properties for Eu 3+ . A one-step hydrothermal method was utilized to synthesize a Eu 3+ and Dy 3+ co-doped hexagonal NaYF 4 phosphor with outstanding chemical stability and thermal luminous performance.…”