Long afterglow materials have a wide range of applications in the technical fields of safety instructions, traffic signs, decoration, etc. as long-lasting luminescent materials at night or in dark conditions. At present, long afterglow materials that emit blue and green light have good commercial products, but red long afterglow materials still have shortcomings such as weak afterglow strength and short duration. In addition, due to the different trap depths and trap densities of different long afterglow materials, the afterglow intensity and afterglow duration of long afterglow materials with different light emitting components are quite different. How to efficiently control the emission color of long afterglow materials and maintain the consistency of afterglow attenuation is the focus of people's attention, and it is also a major technical challenge in this field.
The team of Chen Xueyuan from the Key Laboratory of Functional Nanostructures and Assembly of the Fujian Institute of Research on the Structure of Matter of the Chinese Academy of Sciences presented at the National Natural Science Foundation of China hosted by the Chinese Academy of Sciences 'Strategic Leading Science and Technology Project, the Chinese Academy of Sciences' Innovation International Team, the National Natural Science Foundation of China Strait Joint Fund, and Associate Researcher Zheng Wei With the support of the Fund, the Youth Promotion Association of the Chinese Academy of Sciences and the Spring Seedling Program of the Haixi Research Institute, doctoral student Gong Zhongliang and others proposed a unique high-efficiency based on all-inorganic perovskite quantum dots (CsPbX3, X = Cl, Br, I) The afterglow conversion strategy (Figure 1) achieves efficient and long afterglow luminescence control of the full spectrum in the visible band. The team spin-coated blue-violet CaAl2O4: Eu2 +, Nd3 + (CAO) long afterglow submicron crystals with polydimethylsiloxane (PDMS) as a light-absorbing layer to produce a long afterglow of 440 nm. / PDMS is spin-coated with a mixture of CsPbX3 quantum dots and PDMS as a light conversion layer. Due to the strong absorption of CsPbX3 quantum dots and high fluorescence quantum yield, the afterglow produced by CAO is absorbed by CsPbX3 quantum dots and converted into CsPbX3 luminescence Through the band gap energy tailoring of CsPbX3 quantum dots, continuous regulation of long afterglow luminescence can be achieved. Using CAO as a single energy storage source and the characteristic of narrow emission bands of CsPbX3 quantum dots, this strategy can achieve a narrow band, wide color gamut (> 130% NTSC) long afterglow luminescence, the remaining glow duration> 8h, and different luminescence groups The fractional afterglow attenuation remains highly consistent. Further, the team used red, green, and blue to mix the three primary colors to prove the potential citation of a long-lasting afterglow white light source and a luminous colorful display based on perovskite long afterglow conversion (Figure 2). This work provides a new strategy for long afterglow luminescence control, which breaks through the technical bottlenecks of traditional long afterglow materials, such as insufficient red light components, inconsistent afterglow attenuation, and emission spectrum bandwidth. New applications in anti-counterfeit coding and other fields provide new ideas. Related results were published online on March 27 in the "German Applied Chemistry" magazine (Angew. Chem. Int. Ed. 2019, DOI: 10.1002 / anie.201901045).
Previously, the team of Chen Xueyuan had made a series of progress in the optical performance control and application research of long afterglow and all-inorganic perovskite quantum dot luminescent materials. For example, a three-phase solvothermal synthesis of monodisperse, rechargeable, white LED excited ZnGa2O4: Cr3 + long afterglow nanomaterials was proposed to achieve background-free fluorescence detection of 150 pM avidin protein (Nanoscale 2017, 9, 6846); A new strategy for sensitization of perovskite quantum dots based on radiant energy transfer based on rare earth nanocrystals, for the first time to achieve full-spectrum up-conversion and high-efficiency luminescence control of all-inorganic perovskite quantum dots under low-power near-infrared semiconductor laser (Nat. Commun. 2018, 9, 3462).
Figure 1: Full-spectrum long afterglow luminescence control based on CsPbX3 all-inorganic perovskite quantum dots: schematic diagram, long afterglow luminescence photo, afterglow emission spectrum, afterglow attenuation curve and color coordinate diagram.
Figure 2: Afterglow white light source and luminous colorful display based on CsPbX3 all-inorganic perovskite quantum dot long afterglow conversion strategy.
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