AIE-active Ir(iii) complexes with tunable emissions, mechanoluminescence and their application for data security protection

Abstract

Ir complexes (1–4) show fluorescence-phosphorescence dual-emission and aggregation-induced emission (AIE) properties. Based on the piezochromic and vapochromic behaviors upon grinding-fuming, complex2could be used in data security protection.

An AIE-active phosphorescent Ir(iii) complex with piezochromic luminescence (PCL) and its application for monitoring volatile organic compounds (VOCs)

“…13,14 The original emission colour of the solids can be restored by recovering the initial molecular packing mode via recrystallization or heating. 15,16 In this regard, PCL materials can overcome the shortcomings of instability that is usual for vapochromic materials. Thus, PCL materials have applications in sensors, security materials, and information display/storage.…”

Dual emission and multi-stimuli-response in iridium(iii) complexes with aggregation-induced enhanced emission: applications for quantitative CO2 detection

“…In the literature, there are several examples of dual phosphorescent Ir(III) complexes, [40][41][42][43][44][45][46][47] but dual fluorescent and phosphorescent Ir(III) complexes are still scarce. [48][49][50][51] To the best of our knowledge, the Ir(III) complex that we report herein is the first example of facile emission tuning between a singlet and a triplet state by just varying the solvent's polarity. This certainly opens a whole new range of possibilities for the application of Ir(III) complexes as luminescent probes.…”

Flexible π‐Conjugated 2,5‐Diarylamino‐Terephthalates: A New Class of Mechanochromic Luminophores with Tunable Aggregation States

“…Smart luminescent materials that exhibit tunable luminescent properties in the solid state under mechanical stimuli have received considerable attention in the development of optical data recording and storage devices, as well as fluorescent sensors [1] . Several mechano‐responsive luminescent systems derivate from metal (Au, [2] Cu, [3] Pt, [4] and Ir [5] ) and boron complexes, [6] anthracene‐, [7] pyrene‐, [8] and perylene bisimide‐based dyes, [9] oligo( p ‐phenylenevinylene) derivatives, [10] and aggregation‐induced emission (AIE) compounds [11] have been reported, and various mechanistic explanations such as phase transformation, excimer formation or dissolution, and mechanical stress‐induced chemical changes have been proposed [1a] . However, even with the help of those proposed mechanisms, the development of new mechanochromic luminescent materials (MCLs) still heavily depends on random screening, which makes the rational design of new materials, especially those with high sensitivity to mechanical stimuli, challenging.…”