Optical spectra and crystal field calculation for SrB4O7:Sm2+
PBN-AR
Instytucja
Instytut Fizyki Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN
0925-8388
EISSN
Wydawca
ELSEVIER SCIENCE SA
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
419-427
Numer tomu
661
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
Divalent samarium Luminescence Tetraborate Crystal field Red phosphor
Streszczenia
Język
en
Treść
Undoped and samarium-doped SrB4O7 polycrystalline samples were prepared by a solid state reaction method in air. XRD examination revealed that the undoped sample is consistent with the pure SrB4O7 phase but in samarium-doped sample in addition to the main tetraborate SrB4O7 phase there is a little amount of metaborate. Based on preliminary spectroscopic examination it was ascertained that Sm2+ ions are incorporated without measurable traces of Sm3+ admixture. High resolution luminescence spectra and decay curves of Sm2+ luminescence were measured as a function of temperature in the 5–550 K temperature region. Energies of crystal field components of the 7FJ (J = 1–5) multiplets at 5 K and those of the 5D1 multiplet at 300 K were determined from luminescence spectra and used subsequently as input data for the crystal field calculation. Performed crystal field calculation predicts the energy level scheme for the 4f6 configuration of Sm2+ in SrB4O7 up to 29000 cm−1 and makes it possible to assess the contribution of transitions from the excited states above the 5D1 to luminescence phenomena. Evaluated activation energy Ea ∼4600 cm−1 characterizing a steep decrease of the 5D0 lifetime of Sm2+ between 320 K and 550 K indicates strongly that electronic origin of the lowest energy 7F0 – 4f5d1 vibronic transitions is located around 19200 cm−1, slightly below the 7F0 – 5D3 transition energy.
Cechy publikacji
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Original article
Original article presents the results of original research or experiment.
Inne
System-identifier
PBN-R:720161
CrossrefMetadata from Crossref logo
Cytowania
Liczba prac cytujących tę pracę
Brak danych
Referencje
Liczba prac cytowanych przez tę pracę
Brak danych