Full spectrum long afterglow luminescence of rare earth sensitized perovskite quantum dots realized by Fujian Institute of structure

Long afterglow materials are widely used in the fields of safety indication, traffic sign, decoration and so on At present, blue and green light emitting long afterglow materials have good commercial products, but red light long afterglow materials still have weak afterglow intensity and short duration In addition, due to the different trap depth and trap density of different long afterglow materials, the afterglow intensity and afterglow duration of long afterglow materials with different luminous components are quite different How to control the luminescent color of long afterglow materials efficiently and keep the consistency of afterglow attenuation is the focus of people's attention, and also a major technical challenge in this field Chen Xueyuan, the Key Laboratory of functional nanostructure and assembly of the Chinese Academy of Sciences, Fujian Institute of physical architecture, supported by projects such as the special project of strategic leading science and technology of the Chinese Academy of Sciences, the international team of innovation of the Chinese Academy of Sciences, the channel joint fund of the national Natural Science Foundation and the general fund of the National Natural Science Foundation, the youth Promotion Association of the Chinese Academy of Sciences and the spring seedling program of the Haixi Academy of Sciences chaired by Zheng Wei, Dr Gong Zhongliang et al Proposed a unique high-efficiency long afterglow conversion strategy based on all inorganic perovskite quantum dots (cspbx3, x = Cl, Br, I) (Fig 1), which realized the high-efficiency long afterglow regulation of the visible band full spectrum The team spin coated the blue violet CaAl 2O 4: EU 2 +, Nd 3 + (CAO) long afterglow submicron crystal and PDMS on the slide as the light absorption layer to produce 440 nm long afterglow, and then spin coated a layer of cspbx 3 quantum dot and PDMS mixture on the CaO / PDMS as the light conversion layer, due to the strong absorption and high fluorescence quantum yield of cspbx 3 quantum dot, The afterglow produced by Cao is absorbed by cspbx 3 quantum dots and converted into the luminescence of cspbx 3 The long afterglow can be continuously controlled by band gap energy tailoring of cspbx 3 quantum dots Using Cao as a single energy storage source and narrow emission band of cspbx 3 quantum dots, the strategy can realize long afterglow with narrow band and wide color range (> 130% NTSC) The duration of afterglow is more than 8 h, and the afterglow attenuation of different components is highly consistent Furthermore, the team proved the potential reference of developing long-lasting afterglow white light source based on long-term afterglow conversion of calcium titanium ore and night light colorful display by mixing red, green and blue primary colors Fig 1 Full spectrum long afterglow control based on cspbx 3 all inorganic perovskite quantum dots: schematic diagram, long afterglow photo, afterglow emission spectrum, afterglow decay curve and color coordinate diagram (source: angelw Chem Int ed.) this work provides a new strategy for long afterglow control It breaks through the technical bottlenecks of traditional long afterglow materials, such as insufficient red light components, inconsistent afterglow attenuation, emission spectrum bandwidth, etc., and provides a new idea for the new application of long afterglow materials in the fields of white light source, colorful night light display and anti-counterfeiting coding The results were published in angew Chem Int ed (DOI: 10.1002 / anie 201901045) Prior to that, Chen Xueyuan's team has made a series of important progress in the research of optical performance regulation and application of long afterglow and all inorganic perovskite quantum dot luminescent materials For example, a three-phase solvothermal method is proposed to synthesize ZnGa2O4: Cr3 + long afterglow nano materials with single dispersion, charging and white LED excitation, so as to realize background free fluorescence detection of 150 PM avidin protein (nanoscale 2017, 9, 6846); a new up conversion luminescent strategy of perovskite quantum dots sensitized by radiation energy transfer based on rare earth nanocrystals is proposed For the first time, all inorganic perovskite quantum dots can realize the visible band full spectrum and efficient up conversion luminescent regulation under the excitation of low-power near-infrared semiconductor lasers (NAT Commun 2018, 9, 3462).