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Thermochromic Phosphors Based on One‐Dimensional Ionic Copper‐Iodine Chains Showing Solid‐State Photoluminescence Efficiency Exceeding 99 %

Von Wiley-VCH zur Verfügung gestellt

A novel thermochromic 1D-Cu4I6(4-dimethylamino-1-ethylpyridinium)2 hybrid phosphor with near-unity photoluminescence efficiency is reported involving a mechanism of reversible single-crystal-to-single-crystal transformation induced by temperature-responsive concerted Cu atom migration in ionic copper-iodine chains.


Abstract

Thermochromic phosphors are intriguing materials for realizing thermochromic behaviors of light-emitting diodes. Here a highly luminescent and stable thermochromic phosphor based on one-dimensional Cu4I6(4-dimethylamino-1-ethylpyridinium)2 is reported. This unique ionic copper-iodine chain-based hybrid exhibits near-unity photoluminescence efficiency owing to the through-space charge-transfer character of relevant electronic transitions. More importantly, an alternative mechanism of thermochromic phosphorescence was unraveled, supported by a first principles simulation of concerted copper atom migration in the copper-iodine chain. Furthermore, we successfully fabricate a bright thermochromic light-emitting diode using this Cu4I6(4-dimethylamino-1-ethylpyridinium)2 thermochromic phosphor. Our reported flexible ionic copper-iodine chain-based thermochromic luminescent material represents a new type of cost-effective functional phosphor.

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