Method for broadening the light emitting range of lead-free double perovskite
A luminous range, double perovskite technology, applied in the direction of luminescent materials, chemical instruments and methods, can solve the problems of material stability reduction, lattice distortion, nervous system damage, etc., and achieve the effect of simple steps and low preparation cost
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Embodiment 1
[0030] T301 stainless steel is used as the sealing gasket, and the diamond anvil device is used to pre-press it to a thickness of 50 microns, and then a small hole with a diameter of 120 microns is drilled in the center of the pre-compression position as a pressure chamber. Cs 2 AgBr 6 Thin-film perovskite samples are put into the pressure chamber, sealed with silicone oil as the pressure transmission medium, and the in-situ test is carried out while the diamond anvil generates pressure. The device is as follows: figure 1 shown. Continue to increase the pressure to 22 GPa and then completely release the pressure, and use the Raman spectrometer to test the Cs 2 AgBr 6 Fluorescent signal of perovskite. The result is as Figure 5 Shown, Cs 2 AgBr 6 The fluorescence peak of perovskite first blue-shifted to 600 nm, then red-shifted to 700 nm, and the fluorescence range widened from 520 nm to 1000 nm, with a half-maximum width of 230 nm. Moreover, the pressure was increased ...
Embodiment 2
[0032] The same sample and counter-anvil packaging method as in Example 1 were used. Using the 488 nm laser of the Raman spectrometer as the excitation light, the pressure was continuously increased to 16 GPa, and then the pressure was completely released. The fluorescent signal of the test sample is as follows: Figure 6 As shown, the fluorescence of the sample was blue-shifted to 600 nm and then red-shifted, and a new luminescence shoulder peak appeared in the long wavelength direction, which led to the broadening of the fluorescence spectral range, and its fluorescence range was broadened from 520 nm to 740 nm, half The height and width are 230 nm. After the pressure was removed, the new luminescent shoulder peaks were also retained, and the pressure-treated sample retained the property of fluorescence spectrum broadening, with a half-maximum width of 245 nm.
Embodiment 3
[0034] The same sample and counter-anvil packaging method as in Example 1 were used. Using the 514.5 nm laser of the Raman spectrometer as the excitation light, the pressure was continuously increased to 4 GPa, and then the pressure was completely released to test the fluorescence signal of the sample. The results are as follows: Figure 7 Shown, Cs 2 AgBr 6The perovskite sample had a similar spectral blue shift during the pressurization process, and returned to its original position after the pressure was removed, without spectral broadening.
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