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<p>Purely organic phosphors have emerged as promising materials for various optical applications. Herein, we report a single-component organic phosphorescent crystal, 1,1′-(2,5-dibromoterephthaloyl)bis(glutarimide) (BrGlu), which exhibits fully reversible, pseudopolymorph-dependent phosphorescence color switching. Under standard crystallization conditions, BrGlu forms green-emitting crystal (G-crystal), while crystallization in the presence of CHCl<sub>3</sub> yields blue-emitting solvent-inclusion crystal (B-crystal). Notably, G-crystal converts into B-crystal upon exposure to CHCl<sub>3,</sub> whereas the blue crystals revert to green upon heating, demonstrating a reversible phosphorescence-to-phosphorescence switching mechanism. Through a combination of experimental analyses and quantum chemical calculations, we elucidate the underlying mechanism governing this triplet emission color transformation: <i>syn</i>–<i>anti</i> conformational reorientation of bromine–carbonyl substituents: upon solvent inclusion, hydrogen bonding stabilizes the <i>syn</i>-rotamer to yield bright-blue phosphorescence, whereas gentle heating reverts the system to the <i>anti</i>-rotamer for green emission. Exploiting this property, we develop an advanced data encryption platform featuring a dual-layer security system—phosphorescence emission combined with thermal- or solvent-induced stimuli-response—significantly enhancing security in secure data encryption and anti-counterfeiting.</p>

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Reversible color switching of bright phosphorescence in purely organic materials for advanced data encryption

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月1日

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  • Jung-Moo Heo,
  • Hochul Woo,
  • Maria F. Flórez-Angarita,
  • Jihyun Park,
  • Begoña Milián-Medina,
  • Adam J. Matzger,
  • Johannes Gierschner,
  • Min Sang Kwon,
  • Jinsang Kim

摘要

Purely organic phosphors have emerged as promising materials for various optical applications. Herein, we report a single-component organic phosphorescent crystal, 1,1′-(2,5-dibromoterephthaloyl)bis(glutarimide) (BrGlu), which exhibits fully reversible, pseudopolymorph-dependent phosphorescence color switching. Under standard crystallization conditions, BrGlu forms green-emitting crystal (G-crystal), while crystallization in the presence of CHCl3 yields blue-emitting solvent-inclusion crystal (B-crystal). Notably, G-crystal converts into B-crystal upon exposure to CHCl3, whereas the blue crystals revert to green upon heating, demonstrating a reversible phosphorescence-to-phosphorescence switching mechanism. Through a combination of experimental analyses and quantum chemical calculations, we elucidate the underlying mechanism governing this triplet emission color transformation: syn–anti conformational reorientation of bromine–carbonyl substituents: upon solvent inclusion, hydrogen bonding stabilizes the syn-rotamer to yield bright-blue phosphorescence, whereas gentle heating reverts the system to the anti-rotamer for green emission. Exploiting this property, we develop an advanced data encryption platform featuring a dual-layer security system—phosphorescence emission combined with thermal- or solvent-induced stimuli-response—significantly enhancing security in secure data encryption and anti-counterfeiting.