Energy transfer between different Eu

Supplementary Information

Energy transfer between different Eu

ions in the white phosphor Ba

F

Cl

:Eu

Caroline Hasler^a, Andreas Hauser^a, Jacob Olchowka^a,b and Hans Hagemann^a*,

aDépt.de Chimie Physique, Université de Genève, 30, quai E. Ansermet, CH1211 Geneva Switzerland

bCNRS, Université de Bordeaux, Bordeaux INP, ICMCB UMR 5026, Pessac F-33600, France

Table S1. Examples of the composition of the reaction mixtures (in g) used for the sample preparations.

Table S2. List of samples prepared for this study

Figure S1. Illustration of the crystal structure of Ba7F12Cl2 (space group P-6) highlighting the local surroundings of the three 9-coordinated barium atoms.

Figure S2. Room temperature excitation spectra of sample 261C observed at 400 nm (dark blue), 450nm (light blue), 500 nm (green), 550 nm (brown) and 600 nm (red). Left side: as observed intensities, right side normalized intensities.

Figure S3. Superposition of the room temperature emission spectra excited at 320 nm for the different Europium concentrations, showing the decrease of the intensity of the blue emission and increase of the intensity around 570 nm with increasing Europium concentration.

Figure S4. Example of fitting results using 3 Gaussians for Ba7F12Cl2 : 0.9%Eu excited at 340nm Figure S5. Decay curves excited at 355nm observed for Ba7F12Cl2 : 0.9%Eu at different emission wavelength at 5 K and 100 K.

Figure S6. Emission spectra excited at 266nm observed at 5K for Ba7F12Cl2 : 0.1%Eu and Ba7F12Cl2 : 3.7%Eu. The insert shows the enlarged part of the emission spectrum of Ba7F12Cl2 : 3.7%Eu around 365 nm.

Sampl e

262A (0.9%

Eu)

262B (1.4%

Eu)

BaF2 9.9994 9.9952

LiCl 0.4190 0.4220

KCl 0.7130 0.7000

EuF2 0.0986 0.1530

Table S1. Examples of the composition of the reaction mixtures (in g) used for the sample preparations.

Sample

name Eu²⁺

concentration [%]

261C 0.015

260C 0.1

261B 0.37

262A 0.9

262B 1.4

260B 1.8

260A 3.7

Table S2. List of samples prepared for this study.

Figure S1. Illustration of the crystal structure of Ba7F12Cl2 (space group P-6) highlighting the local surroundings of the three 9-coordinated barium atoms.

50 40 30 20 10 0

x106

450 400

350 300

250

 nm

1.0 0.8 0.6 0.4 0.2 0.0

Normalized Intensity

450 400

350 300

250

 / nm

Figure S2. Room temperature excitation spectra of sample 261C (0.015% Eu) observed at 400 nm (dark blue), 450nm (light blue), 500 nm (green), 550 nm (brown) and 600 nm (red). Left side: as observed intensities, right side normalized intensities.

Figure S3. Superposition of the room temperature emission spectra excited at 320 nm for the different Europium concentrations. The intensity of the spectra are normalized to highlight the decrease of the intensity of the blue emission and increase of the intensity around 570 nm with increasing Europium concentration.

Figure S5. Decay curves excited at 355nm observed for Ba7F12Cl2 : 0.9%Eu at different emission wavelength at 5 K and 100 K.

Figure S6. Emission spectra excited at 266nm observed at 5K for Ba7F12Cl2 : 0.1%Eu and Ba7F12Cl2 : 3.7%Eu. The insert shows the enlarged part of the emission spectrum of Ba7F12Cl2 : 3.7%Eu around 365 nm.