All-Inorganic Bismuth-Based Perovskite Quantum Dots with Bright Blue Photoluminescence and Excellent Stability
All-Inorganic Bismuth-Based Perovskite Quantum Dots with Bright Blue Photoluminescence and Excellent Stability
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具有亮蓝色光致发光和优异稳定性的全无机铋基钙钛矿量子点
DOI：
10.1002/adfm.201704446
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发表时间：
2018-01-04
影响因子：
19
通讯作者：
Tang, Jiang
中科院分区：
文献类型：
--
作者：
Leng, Meiying;Yang, Ying;Tang, Jiang
卤化铅钙钛矿量子点（QD）具有颜色可调和窄带发射，并且非常有希望用于照明和显示应用，但是它们遭受铅毒性和不稳定性。尽管报道了无铅的Bi基和Sn基钙钛矿QD（CsSnX 3、Cs2 SnX 6和（CH 3 NH3）（3）Bi 2X 9），但它们都显示出低的光致发光量子产率（PLQY）和差的稳定性。本文报道了具有高PLQY和优异稳定性的Cs3 Bi 2Br 9钙钛矿量子点的合成。通过使用乙醇作为反溶剂的绿色和简单的过程，合成的Cs3 Bi 2Br 9量子点在410 nm处显示出蓝色发射，PLQY高达19.4%。通过混合前驱体制备的Cs3 Bi 2X 9（X = Cl，Br，I）量子点可以覆盖393 ~ 545 nm的光致发光范围。此外，由于Cs3 Bi 2Br 9量子点的全无机性质和BiOBr的表面钝化，Cs3 Bi 2Br 9量子点显示出优异的光稳定性和水分稳定性，这使得能够一锅法合成Cs3 Bi 2Br 9量子点/二氧化硅复合物。将Cs3 Bi 2Br 9 QD/SiO2复合材料与Y3 Al 5 O 12荧光粉简单复合，制备了无铅钙钛矿白色发光二极管。Cs3 Bi 2Br 9量子点作为无铅钙钛矿量子点的新成员，由于其优异的稳定性和电物理特性，为光电子器件的制备开辟了一条新的途径。
Lead halide perovskite quantum dots (QDs) possess color-tunable and narrow-band emissions and are very promising for lighting and display applications, but they suffer from lead toxicity and instability. Although lead-free Bi-based and Sn-based perovskite QDs (CsSnX3, Cs2SnX6, and (CH3NH3)(3)Bi2X9) are reported, they all show low photoluminescence quantum yield (PLQY) and poor stability. Here, the synthesis of Cs3Bi2Br9 perovskite QDs with high PLQY and excellent stability is reported. Via a green and facile process using ethanol as the antisolvent, as-synthesized Cs3Bi2Br9 QDs show a blue emission at 410 nm with a PLQY up to 19.4%. The whole series of Cs3Bi2X9 (X = Cl, Br, and I) QDs by mixing precursors can cover the photoluminescence emission range from 393 to 545 nm. Furthermore, Cs3Bi2Br9 QDs show excellent photostability and moisture stability due to the all-inorganic nature and the surface passivation by BiOBr, which enables the one-pot synthesis of Cs3Bi2Br9 QD/silica composite. A lead-free perovskite white light-emitting diode is fabricated by simply combining the composite of Cs3Bi2Br9 QD/silica with Y3Al5O12 phosphor. As a new member of lead-free perovskite QDs, Cs3Bi2Br9 QDs open up a new route for the fabrication of optoelectronic devices due to their excellent stability and photophysical characteristics.