Thermochromic luminescence of sol-gel films based on copper iodide clusters

Cédric Tard; Sandrine Perruchas; Sébastien Maron; Xavier F. Le Goff; François Guillen; Alain Garcia; Jacky Vigneron; Arnaud Etcheberry; Thierry Gacoin; Jean Pierre Boilot

doi:10.1021/cm801780g

Thermochromic luminescence of sol-gel films based on copper iodide clusters

Cédric Tard
, Sandrine Perruchas
, Sébastien Maron
, Xavier F. Le Goff
, François Guillen
, Alain Garcia
, Jacky Vigneron
, Arnaud Etcheberry
, Thierry Gacoin
, Jean Pierre Boilot

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

Abstract

The incorporation of copper iodide clusters in sol-gel silica has been investigated to prepare materials with original luminescent properties. The synthesis, structural characterizations, and optical properties of sol-gel films containing [CU₄I₄L₄] clusters, L = phosphine-based ligands, are reported. Clusters studied are [Cu ₄I₄(PPh₂(CH₂)₂Si(OCH ₂CH₃)₃)₄] (C1), able to copolymerize with the silica matrix, and [Cu₄I₄-(PPh ₂(CH₂)₂CH₃)₄] (C2) used as a reference for the characterizations. The luminescent films exhibit the optical properties of these clusters in accordance with XPS and NMR studies demonstrating their integrity in the gel matrix. The temperature dependence of light emission properties of clusters and films shows, for the first time for phosphine-based [Cu₄X₄L₄] clusters, thermochromic luminescence with bright yellow luminescence at room temperature and purple emission at 77 K. As a result of weak Cu-Cu interactions, the two emissive states appear as highly coupled with a low energy barrier (2 kJ·mol-1), leading to a controlled thermochromism in a large temperature range.

Original language	English
Pages (from-to)	7010-7016
Number of pages	7
Journal	Chemistry of Materials
Volume	20
Issue number	22
DOIs	https://doi.org/10.1021/cm801780g
Publication status	Published - 25 Nov 2008

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@article{83e6be7bfb1744cbbc649662ead48869,

title = "Thermochromic luminescence of sol-gel films based on copper iodide clusters",

abstract = "The incorporation of copper iodide clusters in sol-gel silica has been investigated to prepare materials with original luminescent properties. The synthesis, structural characterizations, and optical properties of sol-gel films containing [CU4I4L4] clusters, L = phosphine-based ligands, are reported. Clusters studied are [Cu 4I4(PPh2(CH2)2Si(OCH 2CH3)3)4] (C1), able to copolymerize with the silica matrix, and [Cu4I4-(PPh 2(CH2)2CH3)4] (C2) used as a reference for the characterizations. The luminescent films exhibit the optical properties of these clusters in accordance with XPS and NMR studies demonstrating their integrity in the gel matrix. The temperature dependence of light emission properties of clusters and films shows, for the first time for phosphine-based [Cu4X4L4] clusters, thermochromic luminescence with bright yellow luminescence at room temperature and purple emission at 77 K. As a result of weak Cu-Cu interactions, the two emissive states appear as highly coupled with a low energy barrier (2 kJ·mol-1), leading to a controlled thermochromism in a large temperature range.",

author = "C{\'e}dric Tard and Sandrine Perruchas and S{\'e}bastien Maron and \{Le Goff\}, \{Xavier F.\} and Fran{\c c}ois Guillen and Alain Garcia and Jacky Vigneron and Arnaud Etcheberry and Thierry Gacoin and Boilot, \{Jean Pierre\}",

year = "2008",

month = nov,

day = "25",

doi = "10.1021/cm801780g",

language = "English",

volume = "20",

pages = "7010--7016",

journal = "Chemistry of Materials",

issn = "0897-4756",

number = "22",

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T1 - Thermochromic luminescence of sol-gel films based on copper iodide clusters

AU - Tard, Cédric

AU - Perruchas, Sandrine

AU - Maron, Sébastien

AU - Le Goff, Xavier F.

AU - Guillen, François

AU - Garcia, Alain

AU - Vigneron, Jacky

AU - Etcheberry, Arnaud

AU - Gacoin, Thierry

AU - Boilot, Jean Pierre

PY - 2008/11/25

Y1 - 2008/11/25

N2 - The incorporation of copper iodide clusters in sol-gel silica has been investigated to prepare materials with original luminescent properties. The synthesis, structural characterizations, and optical properties of sol-gel films containing [CU4I4L4] clusters, L = phosphine-based ligands, are reported. Clusters studied are [Cu 4I4(PPh2(CH2)2Si(OCH 2CH3)3)4] (C1), able to copolymerize with the silica matrix, and [Cu4I4-(PPh 2(CH2)2CH3)4] (C2) used as a reference for the characterizations. The luminescent films exhibit the optical properties of these clusters in accordance with XPS and NMR studies demonstrating their integrity in the gel matrix. The temperature dependence of light emission properties of clusters and films shows, for the first time for phosphine-based [Cu4X4L4] clusters, thermochromic luminescence with bright yellow luminescence at room temperature and purple emission at 77 K. As a result of weak Cu-Cu interactions, the two emissive states appear as highly coupled with a low energy barrier (2 kJ·mol-1), leading to a controlled thermochromism in a large temperature range.

AB - The incorporation of copper iodide clusters in sol-gel silica has been investigated to prepare materials with original luminescent properties. The synthesis, structural characterizations, and optical properties of sol-gel films containing [CU4I4L4] clusters, L = phosphine-based ligands, are reported. Clusters studied are [Cu 4I4(PPh2(CH2)2Si(OCH 2CH3)3)4] (C1), able to copolymerize with the silica matrix, and [Cu4I4-(PPh 2(CH2)2CH3)4] (C2) used as a reference for the characterizations. The luminescent films exhibit the optical properties of these clusters in accordance with XPS and NMR studies demonstrating their integrity in the gel matrix. The temperature dependence of light emission properties of clusters and films shows, for the first time for phosphine-based [Cu4X4L4] clusters, thermochromic luminescence with bright yellow luminescence at room temperature and purple emission at 77 K. As a result of weak Cu-Cu interactions, the two emissive states appear as highly coupled with a low energy barrier (2 kJ·mol-1), leading to a controlled thermochromism in a large temperature range.

U2 - 10.1021/cm801780g

DO - 10.1021/cm801780g

M3 - Article

AN - SCOPUS:57549116826

SN - 0897-4756

VL - 20

SP - 7010

EP - 7016

JO - Chemistry of Materials

JF - Chemistry of Materials

IS - 22

ER -

Thermochromic luminescence of sol-gel films based on copper iodide clusters

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