V Kamalarasan, Venkateswaran Chakrawarthy
Department of Nuclear physics, University of Madras School of Physical Sciences, Department of Nuclear Physics, University of Madras, Guindy campus, Chennai, Chennai, Tamil Nadu, 6000025, INDIA.
Department of Nuclear Physics, University of Madras School of Physical Sciences, Department of Nuclear physics, University of Madras, guindy campus, Chennai, Tamil Nadu, Chennai, Tamil Nadu, 600025, INDIA.
Nanotechnology. 2024 Sep 25. doi: 10.1088/1361-6528/ad7f62.
Perovskite quantum dots (QDs) have been widely investigated for their excellent properties such as high color purity in displays, tunable emission wavelength, and high photoluminescence quantum yield. For device applications, improving the stability is an area of interest. In this study, the effects of UV irradiation on the structural and luminescence properties of CsPbBr3 perovskite quantum dots (CPB QDs) excited at 365 nm were investigated. To overcome the effects of UV irradiation, a CPB QDs/PVDF composite flexible film was prepared. It exhibits high structural and optical stability under UV irradiation and emits a highly intense green color. The emission wavelength and intensity were observed for three years, and the stability of the temperature-dependent emission intensity up to 400 K has been reported. In addition, it is stable in water. A white LED, fabricated by integrating a blue LED with CPB QDs/PVDF composite film and red phosphor, produces bright natural white light [(CIE x, CIE y) = (0.3704, 0.3611), and CCT = 4177 K] with a color gamut area coverage of 86.4% of the standard NTSC (1953) color space.
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钙钛矿量子点（QDs）因其优异的性能，如显示器中的高色纯度、可调发射波长和高光致发光量子产率，而受到广泛研究。对于器件应用而言，提高稳定性是一个备受关注的领域。在本研究中，研究了紫外线照射对在365nm激发的CsPbBr3钙钛矿量子点（CPB QDs）的结构和发光性能的影响。为了克服紫外线照射的影响，制备了CPB QDs/PVDF复合柔性薄膜。它在紫外线照射下表现出高结构稳定性和光学稳定性，并发出高强度的绿色光。观察了三年的发射波长和强度，并报道了温度高达400K时发射强度的稳定性。此外，它在水中稳定。通过将蓝色LED与CPB QDs/PVDF复合薄膜和红色荧光粉集成制备的白色LED，产生明亮的自然白光[（CIE x，CIE y）=（0.3704，0.3611），CCT = 4177K]，色域面积覆盖率为标准NTSC（1953）颜色空间的86.4%。
