Abstract
Ultralong organic phosphorescence (UOP) crystals have attracted increased attention due to the distinct photophysical property of a long-lived lifetime. However, organic crystals are generally brittle, leading to a serious problem for their application in flexible technology. Herein, we report three types of elastic organic crystals (EOCs) with ultralong phosphorescence via introducing halogen atoms (Cl, Br, I) into π-conjugated phosphorescent molecules. Especially, the crystal containing iodine atoms displayed both excellent elasticity (ε = 3.01%) and high phosphorescent efficiency (ΦPh = 19.1%) owing to the strong halogen bonds. Taking advantage of its highly efficient UOP and excellent elasticity, we successfully used a DCz4I crystal for anti-counterfeiting application. These findings may provide guidance for the development of elastic crystals with afterglow and expand the scope of potential applications on flexible materials.
Highlights
Flexible electronics is becoming an emerging research field with a rapid growth rate due to their innovative applications in displays[1,2], electronic skin[3], and solar cells[4], which accelerate the course of flexible materials
Thereinto, organics show great promise in high-performance device applications owing to their extensive resource, tunable functions, and well processability
The luminescent properties of Elastic organic crystals (EOCs) play an important role in the applications of flexible devices
Summary
Flexible electronics is becoming an emerging research field with a rapid growth rate due to their innovative applications in displays[1,2], electronic skin[3], and solar cells[4], which accelerate the course of flexible materials. Inspired by the requirement of the reversible deformation of crystals and efficient UOP, we reasoned that halogen atoms and π-conjugated phosphorescent chromophores will be suitable candidates as molecular structural units to construct elastic crystals (Fig. 1a). The high phosphorescence efficiency can be achieved by introducing the halogen atoms to increase ISC (Fig. 1b).
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