Inter-Stark Energy Levels and Effects of Temperature on Sharp Emission Lines of Nd3+ in LiYF4

Abstract

The inter‐Stark components of the 4I9/2 and 4I11/2 manifolds have been characterized using the room‐temperature fluorescence spectra for the 4F3/2 → 4I9/2 and 4F3/2 → 4I11/2 transitions of Nd3+ in LiYF4 laser crystal. The thermal effects on the linewidths, positions, and line shifts of the inter‐Stark transitions of the 908 (R1 → X5) and 1052.4 (R1 → Y2) nm lines within the respective intermanifold transitions of 4F3/2 → 4I9/2 t and 4F3/2 → 4I11/2 t have been also investigated. The linewidths of these transitions are found to increase with increasing temperature. The 908 nm line is found to shift toward the shorter wavelength, while the 1052.4 nm line has shifted toward the longer wavelength. The experimental results of the temperature‐dependent widths and shifts of these sharp spectral lines are explained using the phonon–ion interaction theory which assumes the Debye model for phonons in crystalline solids.

YVO4:Nd3+ nanophosphors as NIR-to-NIR thermal sensors in wide temperature range

“…According to the phonon theory 38 , 39 , the line position is affected by the crystal strain inhomogeneity, direct one-phonon processes, multiphonon processes, and Raman phonon scattering processes. As was found in earlier studies 36 , 40 , thermal shift is mainly governed by electron–host interaction effect associated with Raman scattering, and therefore the simplified theoretical expressions for the line shift can be written in the following form 41 : where υ 0 , α, Θ D represent the initial line position (determined at low temperature, in this paper at 123 K), the electron–host coupling parameter, and the effective Debye temperature, respectively. We monitored position of the most intensive emission band of YVO 4 :Nd 3+ 2.4 at % NPs, which is attributed to the transition between the Stark levels of the 4 F 3/2 and 4 I 11/2 states (Fig.…”

Research on the thermal shifts and electron–phonon coupling parameters of Ri lines for Cr3+ ions in LaGaO3 and LaAlO3 crystals

“…However, differing from Eq. (1) which can explain only the red-shift of spectral lines [22,23], Eq. (2) can explain (or fit) consistently the red-shift, almost no-shift and blue-shift for the spectral lines of d n and 4f n ions in crystals [21,[24][25][26][27][28] because it contains the competition between the vibrational and static contributions to the thermal shifts.…”

Crystal-Field Splittings and Phonon Effects on a Sharp Emission Line within a Manifold of Pr3+ in Ca5(PO4)3F Laser Host

“…These values are given in Table 1. The Debye temperature Q D , for Nd 3þ in various laser hosts was found to vary between 400 and 500 K; the coupling coefficient a for the 1064 nm line of Nd 3þ varies between 50 and 150 cm À1 [19,20].…”