Spectroscopic peculiarities of CsCaI3:Tm2+ single crystals examined through one-photon and excited state excitation spectroscopy

Karbowiak, Mirosław; Lisiecki, Radosław; Solarz, P.; Komar, Jarosław; Ryba‐Romanowski, W.

doi:10.1016/j.jallcom.2018.01.058

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…In addition, the values are close to those found previously for other Tm 2+ -doped halides and typically represent a few phonon energies at most. [1,4,6,8,13] The related quenching mechanism can then most likely be attributed to temperature dependent multiphonon relaxation, as was previously also concluded by Grimm et al [1,4,6] The peculiar evolution in shape of the decay spectra in figure 6b are also seen for emission D in NaCl:Tm 2+ and NaI:Tm 2+ as can be witnessed in the supplementary information. Below 100K a single exponential decay is observed.…”

Section: Emission Dsupporting

confidence: 72%

“…It has been observed before in Tm 2+ -doped di-and trihalides. [2,4,6,8] In addition, its relatively short decay time of 1015ns at 20K reflects the parityallowed nature of a typical 5d→4f transition. In a similar manner, the wavelength of emission C can be coupled to an excitation band located at 676nm, which represents the spin-allowed ( 3 H6,t2g)S=1/2-band.…”

Section: Classification Of Emissionsmentioning

confidence: 99%

“…It can be related to the 2 F5/2→ 2 F7/2 transition as observed many times before. [1,[4][5][6]8,9,13] In addition, it has a relatively long decay time of 4.2ms at 20K, which is archetypal for non-parity allowed 4f-4f transitions. As an overall observation, all 5d-4f emissions gradually shift towards longer wavelength upon varying the anion from Cl to Br, and finally I.…”

Section: Classification Of Emissionsmentioning

confidence: 99%

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Temperature dependent relaxation dynamics of luminescent NaX:Tm2+ (X=Cl, Br, I)

Plokker

Kolk

2019

Journal of Luminescence

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In recent years, Thulium in its 2+ oxidation state has been identified as candidate dopant in halide hosts for luminescent solar concentrators. Yet, some of its luminescent properties with regard to these applications remain unexplored. In this study we report on the temperature dependent photo-luminescent behaviour of NaCl:Tm 2+ , NaBr:Tm 2+ , and NaI:Tm 2+ . These monohalide materials demonstrate up to five distinct emission peaks which can be attributed to the 4f 12 →4f 12 and 4f 11 5d 1 →4f 12 transitions of Tm 2+ . Their time-and temperature dependent luminescence intensity behaviours are explained by a qualitative model describing the thermally stimulated radiative-and non-radiative relaxation dynamics. The behaviour of Tm 2+ in these monohalides proves to be similar to earlier reported findings on Tm 2+ -doped trihalide perovskites of the form CsCaX3 (X=Cl, Br, I), however, the 4f-4f emission remains by far the most dominant emission between 10-300K.

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