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Steady and transient optical properties of CsPbBr3/Pb3(PO4)2 perovskite quantum dots for white light-emitting diodes
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2022-10-17 , DOI: 10.1039/d2tc03092f Yuxin Liu 1 , Jian Xu 1 , Ruijun Jia 2 , Lei Song 1 , Junfeng Lu 3 , Jun Dai 1
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2022-10-17 , DOI: 10.1039/d2tc03092f Yuxin Liu 1 , Jian Xu 1 , Ruijun Jia 2 , Lei Song 1 , Junfeng Lu 3 , Jun Dai 1
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Surface passivation has been widely accepted as an effective method to improve the stability and photoluminescence (PL) performance of perovskite quantum dots (QDs). In this paper, we report Pb3(PO4)2-coated CsPbBr3 QDs as the phosphor materials for white light-emitting diodes. The Pb3(PO4)2 coated layer could effectively improve the stability and optical properties of CsPbBr3 QDs, including PL intensity, average PL lifetime, and PL quantum yield. Moreover, the temperature-dependent PL spectra of CsPbBr3 and CsPbBr3/Pb3(PO4)2 QDs were investigated. It was found that the exciton binding energy and electron–phonon coupling effect of CsPbBr3/Pb3(PO4)2 QDs was larger than that of uncoated QDs. According to the results of transient absorption (TA), intraband hot-exciton relaxation and exciton recombination can be slowed down when the CsPbBr3 QDs are coated with Pb3(PO4)2. In addition, white light-emitting diode devices were fabricated by integrating the green CsPbBr3/Pb3(PO4)2 QDs and red CsPbBr1I2/Pb3(PO4)2 QDs on the blue GaN chips. The devices showed stable white light emission with Commission Internationale de L’Eclairage color coordinates of (0.297, 0.333). As indicated by the results, Pb3(PO4)2-coated perovskite QDs could be an ideal down-conversion fluorescent material for white light-emitting diode devices.
中文翻译：
用于白光发光二极管的 CsPbBr3/Pb3(PO4)2 钙钛矿量子点的稳态和瞬态光学特性
表面钝化已被广泛认为是提高钙钛矿量子点（QD）稳定性和光致发光（PL）性能的有效方法。在本文中，我们报道了 Pb 3 (PO 4 ) 2涂层 CsPbBr 3量子点作为白光发光二极管的荧光粉材料。Pb 3 (PO 4 ) 2涂层可以有效提高CsPbBr 3 QDs的稳定性和光学性能，包括PL强度、平均PL寿命和PL量子产率。此外，CsPbBr 3和 CsPbBr 3 /Pb 3 (PO 4 )的温度依赖性 PL 光谱研究了2 个量子点。发现CsPbBr 3 /Pb 3 (PO 4 ) 2量子点的激子结合能和电子-声子耦合效应大于未涂覆的量子点。根据瞬态吸收(TA)的结果，当CsPbBr 3量子点涂覆Pb 3 (PO 4 ) 2时，带内热激子弛豫和激子复合可以减慢。此外，通过集成绿色 CsPbBr 3 /Pb 3 (PO 4 ) 2量子点和红色 CsPbBr 1 I 2来制造白色发光二极管器件。蓝色 GaN 芯片上的/Pb 3 (PO 4 ) 2 QD。这些设备显示出稳定的白光发射，Commission Internationale de L'Eclairage 颜色坐标为 (0.297, 0.333)。结果表明，Pb 3 (PO 4 ) 2包覆的钙钛矿量子点可以成为理想的白光发光二极管器件的下转换荧光材料。
更新日期：2022-10-17
中文翻译：
用于白光发光二极管的 CsPbBr3/Pb3(PO4)2 钙钛矿量子点的稳态和瞬态光学特性
表面钝化已被广泛认为是提高钙钛矿量子点（QD）稳定性和光致发光（PL）性能的有效方法。在本文中，我们报道了 Pb 3 (PO 4 ) 2涂层 CsPbBr 3量子点作为白光发光二极管的荧光粉材料。Pb 3 (PO 4 ) 2涂层可以有效提高CsPbBr 3 QDs的稳定性和光学性能，包括PL强度、平均PL寿命和PL量子产率。此外，CsPbBr 3和 CsPbBr 3 /Pb 3 (PO 4 )的温度依赖性 PL 光谱研究了2 个量子点。发现CsPbBr 3 /Pb 3 (PO 4 ) 2量子点的激子结合能和电子-声子耦合效应大于未涂覆的量子点。根据瞬态吸收(TA)的结果，当CsPbBr 3量子点涂覆Pb 3 (PO 4 ) 2时，带内热激子弛豫和激子复合可以减慢。此外，通过集成绿色 CsPbBr 3 /Pb 3 (PO 4 ) 2量子点和红色 CsPbBr 1 I 2来制造白色发光二极管器件。蓝色 GaN 芯片上的/Pb 3 (PO 4 ) 2 QD。这些设备显示出稳定的白光发射，Commission Internationale de L'Eclairage 颜色坐标为 (0.297, 0.333)。结果表明，Pb 3 (PO 4 ) 2包覆的钙钛矿量子点可以成为理想的白光发光二极管器件的下转换荧光材料。
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