Bright emission and high photoluminescence CsPb2Br5 NCs encapsulated in mesoporous silica with ultrahigh stability and excellent optical properties for white light-emitting diodes†,Journal of Materials Chemistry C

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Bright emission and high photoluminescence CsPb2Br5 NCs encapsulated in mesoporous silica with ultrahigh stability and excellent optical properties for white light-emitting diodes†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019-10-09 , DOI: 10.1039/c9tc04442f
Guangzhan Shao _{1,

2,

3,

4} , Yi Zhao _{1,

2,

3,

4} , Yanxia Yu _{1,

2,

3,

4} , Haisheng Yang _{1,

2,

3,

4} , Xiaodong Liu _{1,

2,

3,

4} , Yujie Zhang _{1,

2,

3,

4} , Weidong Xiang _{1,

2,

3,

4} , Xiaojuan Liang _{1,

2,

3,

4}

Affiliation

All-inorganic cesium lead halide perovskite CsPb₂Br₅ nanocrystals (NCs) have attracted tremendous attention owing to their unique optoelectronic properties. However, their tolerance to atmospheric moisture is limited by their corresponding poor stability, which has drastically prevented the broad application of the materials in lasers, light-emitting diodes (LED) and, most recently, photocatalysis. To address this issue, we have successfully demonstrated the design and synthesis of a nanocomposite material, CsPb₂Br₅ NCs coated in mesoporous silica (NCs-MS), with high photoluminescence (PL) intensity, bright emission and enhanced water stability, thermal stability and photostability versus naked CsPb₂Br₅ NCs. The components and structure of the prepared CsPb₂Br₅ NCs-MS nanocomposite were investigated in detail by PL, XRD, TEM and HAADF-STEM studies. Furthermore, the mechanism behind the outstanding stability and optical properties of the prepared NCs-MS nanocomposite is discussed. Owing to the ultrahigh stability of the NCs-MS nanocomposite, the white LED (WLED) assembled by coating the CsPb₂Br₅ NCs-MS nanocomposite and commercial red CaAlSiN₃:Eu²⁺ phosphor powder on an InGaN blue chip showed CIE chromaticity coordinates of (0.3377, 0.3309) and presented excellent optical parameters with a CRI of 82.9, a CCT of 5035 K and an LE of 64.9 lm W⁻¹. This work provides a new pathway for the synthesis and application of all-inorganic cesium lead halide perovskite materials in WLEDs and display devices.

中文翻译：

封装在介孔二氧化硅中的亮发射和高光致发光CsPb ₂ Br ₅ NCs具有超高的稳定性和出色的光学性能，适用于白色发光二极管†

全无机卤化铯铯钙钛矿CsPb ₂ Br ₅纳米晶体（NCs）由于其独特的光电性能而引起了极大的关注。然而，它们对大气湿气的耐受性受到其相应的较差的稳定性的限制，这严重阻止了该材料在激光器，发光二极管（LED）以及最近的光催化中的广泛应用。为了解决这个问题，我们成功地证明了纳米复合材料CsPb ₂ Br ₅ NCs的介孔二氧化硅（NCs-MS）涂层的设计和合成，该材料具有高的光致发光（PL）强度，光发射和增强的水稳定性，热稳定性和光稳定性与裸露的CsPb₂ Br₅ NCs。通过PL，XRD，TEM和HAADF-STEM研究，详细研究了制备的CsPb₂ Br₅ NCs-MS纳米复合材料的成分和结构。此外，还讨论了所制备的NCs-MS纳米复合材料具有出色的稳定性和光学性能的机理。由于NCs-MS纳米复合材料的超高稳定性，通过涂覆CsPb₂ Br₅ NCs-MS纳米复合材料和商用红色CaAlSiN₃：Eu²⁺组装而成的白色LED（WLED）InGaN蓝片上的荧光粉显示CIE色度坐标为（0.3377，0.3309），并具有出色的光学参数，CRI为82.9，CCT为5035 K，LE为64.9 lm W ^-1。这项工作为WLED和显示设备中全无机卤化铯铅钙钛矿材料的合成和应用提供了一条新途径。

更新日期：2019-11-07

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