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Cs4PbBr6/CsPbBr3 perovskite composites for WLEDs: pure white, high luminous efficiency and tunable color temperature

机译:CS4PBBR6 / CSPBBR3 Perovskite复合材料用于WLEDS:纯白色,高发光效率和可调色温

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Cs _(4) PbBr _(6) /CsPbBr _(3) perovskite composites are fabricated by room-temperature one-pot mixing synthesis, which is short in time, free from inert gases and delivers a high product yield. Temperature-dependent photoluminescence shows that a larger exciton binding energy of 291.1 meV exhibits better thermal stability compared with that of pure Cs _(4) PbBr _(6) and CsPbBr _(3) materials. The CIE chromaticity coordinates (0.1380, 0.7236) of green LEDs designed with Cs _(4) PbBr _(6) /CsPbBr _(3) perovskite composites show almost no variation under driving current changing from 5 to 30 mA. Furthermore, the ground Cs _(4) PbBr _(6) /CsPbBr _(3) perovskite composites mixed with red emitting K _(2) SiF _(6) :Mn ~(4+) phosphor are dropped and casted on a blue-emitting InGaN chip. The white light emitting diodes (WLEDs) are presented, which have good luminous efficiency of 65.33 lm W ~(?1) at 20 mA, a correlated color temperature of 5190 K, and the white gamut with chromaticity coordinate of (0.3392, 0.3336). According to the state of art, these excellent characteristics observed are much superior to the reported results of conventional perovskite-based WLEDs, which demonstrate the immense potential and great prospect of Cs _(4) PbBr _(6) /CsPbBr _(3) perovskite composites to replace conventional phosphors in lighting devices.
机译:CS _(4)PBBR _(6)/ CSPBBR _(3)钙钛矿复合材料由室温一锅混合合成制造,即速度短,没有惰性气体,并提供高产品产率。温度依赖性光致发光表明,与纯CS _(4)PBBR _(6)和CSPBBR _(3)材料相比,291.1 MeV的较大激子结合能表现出更好的热稳定性。 CIE色度坐标(0.1380,0.7236)设计,使用CS _(4)PBBR _(6)/ cspbbr _(3)钙钛矿复合材料在驱动电流从5到30 mA变化时显示几乎没有变化。此外,接地CS _(4)PBBR _(6)/ CSPBBR _(3)钙钛矿复合材料与红色发射k _(2)SIF _(6):Mn〜(4+)磷光体掉落并浇铸蓝色发光Ingan芯片。提出了白色发光二极管(WLED),其在20 mA的良好发光效率为65.33 LMW〜(α1),相关的色温为5190 k,以及与色度坐标(0.3392,0.3336)的白色色域。根据现有技术,观察到的这些优异的特征远远优于报告的常规钙钛矿的WLED结果,这证明了CS _(4)PBBR _(6)/ CSPBBR _(3)的巨大潜力和巨大前景Perovskite复合材料以取代照明装置中的传统磷光体。

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