Green Luminescence of Divalent Europium in the Hydride Chloride EuHCl

Nathalie Kunkel; Daniel Rudolph; A Meijerink; Stefan Rommel; Richard Weihrich; Holger Kohlmann; Thomas Schleid

doi:10.1002/zaac.201400531

Green Luminescence of Divalent Europium in the Hydride Chloride EuHCl

Nathalie Kunkel, Daniel Rudolph, A Meijerink, Stefan Rommel, Richard Weihrich, Holger Kohlmann^*, Thomas Schleid

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

Luminescence properties of divalent europium in the mixed-anion hydride chloride EuHCl were studied for the first time. Olive-green single crystals of EuHCl (PbFCl-type structure: tetragonal, P4/nmm, a = 406.58(3) pm, c = 693.12(5) pm, c/a = 1.705, Z = 2) resulted from the reaction of elemental europium (Eu), sodium hydride (NaH) and sodium chloride (NaCl), while powder samples were prepared from the binary components europium dihydride (EuH2) and dichloride (EuCl2). Low temperature X-ray powder diffraction proved the absence of phase transitions for 12(2) K T 295(2) K. Bright green emission was observed under UV-excitation and assigned to the 4f(6)5d(1)-4f(7) transition of divalent europium. Temperature-dependent luminescence absorption and emission, as well as lifetime measurements were carried out on single crystal and powder samples. Surprisingly, only limited concentration quenching was found. Additionally, two emission bands (485 and 510 nm) are observed, whose intensity ratio depends strongly on temperature. In order to explain this behavior for a single Eu2+ site, we suggest either a dynamical Jahn-Teller effect in the excited 5d(1) state or emission from both a 4f(6)5d(1) state and a trapped exciton state.

Original language	English
Pages (from-to)	1220-1224
Number of pages	5
Journal	Zeitschrift fur Anorganische und Allgemeine Chemie
Volume	641
Issue number	7
DOIs	https://doi.org/10.1002/zaac.201400531
Publication status	Published - Jun 2015

Funding

We are grateful to the Deutsche Forschungsgemeinschaft (DFG grant KO1803/7-1) for financial support. We would like to thank Dr. Philippe Goldner and Prof. Dr. Horst Philipp Beck for discussions, M. Sc. Tim Senden and Sebastian Haumann for technical support and the Landesgraduiertenforderung Saar for a doctoral scholarship.

Keywords

Europium
Hydrides
Chlorides
Crystal structure
Luminescence
Dynamic Jahn-Teller effect
Trapped exciton emission
CRYSTAL-STRUCTURES
PHOTOSTIMULATED LUMINESCENCE
EXCITATION-SPECTRA
ENERGY MIGRATION
EMISSION
EU
BR
CL
DIFFRACTION
DEUTERIDES

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Kunkel_et_al-2015-Zeitschrift_f-r_anorganische_und_allgemeine_ChemieFinal published version, 554 KBLicence: Taverne

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@article{5a77695068a245f887f9063e5dd29ed1,

title = "Green Luminescence of Divalent Europium in the Hydride Chloride EuHCl",

abstract = "Luminescence properties of divalent europium in the mixed-anion hydride chloride EuHCl were studied for the first time. Olive-green single crystals of EuHCl (PbFCl-type structure: tetragonal, P4/nmm, a = 406.58(3) pm, c = 693.12(5) pm, c/a = 1.705, Z = 2) resulted from the reaction of elemental europium (Eu), sodium hydride (NaH) and sodium chloride (NaCl), while powder samples were prepared from the binary components europium dihydride (EuH2) and dichloride (EuCl2). Low temperature X-ray powder diffraction proved the absence of phase transitions for 12(2) K T 295(2) K. Bright green emission was observed under UV-excitation and assigned to the 4f(6)5d(1)-4f(7) transition of divalent europium. Temperature-dependent luminescence absorption and emission, as well as lifetime measurements were carried out on single crystal and powder samples. Surprisingly, only limited concentration quenching was found. Additionally, two emission bands (485 and 510 nm) are observed, whose intensity ratio depends strongly on temperature. In order to explain this behavior for a single Eu2+ site, we suggest either a dynamical Jahn-Teller effect in the excited 5d(1) state or emission from both a 4f(6)5d(1) state and a trapped exciton state.",

keywords = "Europium, Hydrides, Chlorides, Crystal structure, Luminescence, Dynamic Jahn-Teller effect, Trapped exciton emission, CRYSTAL-STRUCTURES, PHOTOSTIMULATED LUMINESCENCE, EXCITATION-SPECTRA, ENERGY MIGRATION, EMISSION, EU, BR, CL, DIFFRACTION, DEUTERIDES",

author = "Nathalie Kunkel and Daniel Rudolph and A Meijerink and Stefan Rommel and Richard Weihrich and Holger Kohlmann and Thomas Schleid",

year = "2015",

month = jun,

doi = "10.1002/zaac.201400531",

language = "English",

volume = "641",

pages = "1220--1224",

journal = "Zeitschrift fur Anorganische und Allgemeine Chemie",

issn = "0044-2313",

publisher = "Wiley-VCH Verlag",

number = "7",

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TY - JOUR

T1 - Green Luminescence of Divalent Europium in the Hydride Chloride EuHCl

AU - Kunkel, Nathalie

AU - Rudolph, Daniel

AU - Meijerink, A

AU - Rommel, Stefan

AU - Weihrich, Richard

AU - Kohlmann, Holger

AU - Schleid, Thomas

PY - 2015/6

Y1 - 2015/6

N2 - Luminescence properties of divalent europium in the mixed-anion hydride chloride EuHCl were studied for the first time. Olive-green single crystals of EuHCl (PbFCl-type structure: tetragonal, P4/nmm, a = 406.58(3) pm, c = 693.12(5) pm, c/a = 1.705, Z = 2) resulted from the reaction of elemental europium (Eu), sodium hydride (NaH) and sodium chloride (NaCl), while powder samples were prepared from the binary components europium dihydride (EuH2) and dichloride (EuCl2). Low temperature X-ray powder diffraction proved the absence of phase transitions for 12(2) K T 295(2) K. Bright green emission was observed under UV-excitation and assigned to the 4f(6)5d(1)-4f(7) transition of divalent europium. Temperature-dependent luminescence absorption and emission, as well as lifetime measurements were carried out on single crystal and powder samples. Surprisingly, only limited concentration quenching was found. Additionally, two emission bands (485 and 510 nm) are observed, whose intensity ratio depends strongly on temperature. In order to explain this behavior for a single Eu2+ site, we suggest either a dynamical Jahn-Teller effect in the excited 5d(1) state or emission from both a 4f(6)5d(1) state and a trapped exciton state.

AB - Luminescence properties of divalent europium in the mixed-anion hydride chloride EuHCl were studied for the first time. Olive-green single crystals of EuHCl (PbFCl-type structure: tetragonal, P4/nmm, a = 406.58(3) pm, c = 693.12(5) pm, c/a = 1.705, Z = 2) resulted from the reaction of elemental europium (Eu), sodium hydride (NaH) and sodium chloride (NaCl), while powder samples were prepared from the binary components europium dihydride (EuH2) and dichloride (EuCl2). Low temperature X-ray powder diffraction proved the absence of phase transitions for 12(2) K T 295(2) K. Bright green emission was observed under UV-excitation and assigned to the 4f(6)5d(1)-4f(7) transition of divalent europium. Temperature-dependent luminescence absorption and emission, as well as lifetime measurements were carried out on single crystal and powder samples. Surprisingly, only limited concentration quenching was found. Additionally, two emission bands (485 and 510 nm) are observed, whose intensity ratio depends strongly on temperature. In order to explain this behavior for a single Eu2+ site, we suggest either a dynamical Jahn-Teller effect in the excited 5d(1) state or emission from both a 4f(6)5d(1) state and a trapped exciton state.

KW - Europium

KW - Hydrides

KW - Chlorides

KW - Crystal structure

KW - Luminescence

KW - Dynamic Jahn-Teller effect

KW - Trapped exciton emission

KW - CRYSTAL-STRUCTURES

KW - PHOTOSTIMULATED LUMINESCENCE

KW - EXCITATION-SPECTRA

KW - ENERGY MIGRATION

KW - EMISSION

KW - EU

KW - BR

KW - CL

KW - DIFFRACTION

KW - DEUTERIDES

U2 - 10.1002/zaac.201400531

DO - 10.1002/zaac.201400531

M3 - Article

SN - 0044-2313

VL - 641

SP - 1220

EP - 1224

JO - Zeitschrift fur Anorganische und Allgemeine Chemie

JF - Zeitschrift fur Anorganische und Allgemeine Chemie

IS - 7

ER -

Green Luminescence of Divalent Europium in the Hydride Chloride EuHCl

Abstract

Funding

Keywords

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