Gd3+ ion induced UV upconversion emission and temperature sensing in Tm3+/Yb3+:Y2O3 phosphor

Tunable ultra-broadband full-visible-spectral emission of Bi3+-doped aluminate phosphors enabled by structure transformation and site occupancy engineering

“…The PL emission intensity increases to the maximum at x = 0.02 and then decreases rapidly with further increases in x, due to the concentration quenching effect. 31,32 As shown in Fig. 3b and Fig.…”

Synthesis and upconversion emission studies of CaYF5:Ho3+/Yb3+ phosphor and its applications in optical thermometry, fingerprint detection, and security ink

“…The CaYF 5 lattice shows direct allowed transition hence value of n will be 1/2 in this case. 7,26 This value can be found by fitting the Tauc plot for all four n values corresponding to each type of band gap transition. Combinations of the above three equations yield an equation[ F ( R ) hν ] 2 = C ( hν − E g )Now using this eqn (iv) we plot a graph between [ F ( R ) hν ] 2 and hν and then extrapolate the linear part of this curve to zero this gives the value of the band gap.…”

“…The CaYF 5 lattice shows direct allowed transition hence value of n will be 1/2 in this case. 7,26 This value can be found by tting the Tauc plot for all four n values corresponding to each type of band gap transition. Combinations of the above three equations yield an equation…”

“…For this upconversion emission spectra were recorded at various excitation powers. For upconversion emission process the emission intensity varies with pump power according to the relation I f P n , 7,8,27,28 where I is the upconversion emission intensity; P is the pump power and n is the number of photons involved in a particular emission. In Fig.…”

“…Inorganic materials doped with lanthanide ions have found tremendous applications across various elds like temperature sensing, bio-imaging, solar cells and security. [1][2][3][4][5][6][7][8][9][10] They have some unique features of converting NIR photons to intense visible or UV photons, atomic emissions like narrow line width and long lifetime. They are usually composed of a low phonon host matrix with suitable rare earth ions doped within it.…”