| Autor: |
Zhou, Jiangcong, Lai, Yiqing, Lin, Na, Huang, Xiaotian, Chen, Yu, Yao, Yao, Wang, Bo |
| Předmět: |
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| Zdroj: |
NANO; Dec2019, Vol. 14 Issue 12, pN.PAG-N.PAG, 10p |
| Abstrakt: |
Currently, the poor stability of inorganic perovskite CsPbX3 (X = Cl , Br, I) nanocrystals restricts their practical application in optoelectronic devices. Therefore, improving the stability of this material remains an urgent task for most researchers. In this study, incorporation of CsPbBr3 nanocrystals into porous AlO(OH) matrices through simple in situ synthesis was demonstrated to be an efficient approach for improving the nanocrystal stability. X-ray diffraction (XRD) revealed that the as-obtained product was composed of cubic CsPbBr3 nanocrystals and orthorhombic AlO(OH) compounds. In addition, transmission electron microscopy (TEM) revealed that the CsPbBr3 nanocrystals were successfully encapsulated by AlO(OH) matrices. The Brunauer–Emmett–Teller (BET) specific surface area was 234.96 m2 g − 1 for AlO(OH) and 60.08 m2 g − 1 for the CsPbBr3@AlO(OH) composites. The decrease in surface area could be attributed to the filling of the AlO(OH) pores by the CsPbBr3 nanocrystals. Further, the as-prepared composites showed red-shifted emission at 522 nm and a larger full width at half-maximum (FWHM) as 26 nm, compared with those of the CsPbBr3 nanocrystals with the emission at 517 nm and FWHM as 17 nm. More importantly, the emission intensity preserved 67% of the original value after a storage time of 120 h, but bare CsPbBr3 nanocrystals rapidly degraded within only 1 h in the polar ethanol solution. Finally, a light-emitting diode (LED) device was fabricated by coating the CsPbBr3@AlO(OH) composites and red commercial K2SiF6:Mn 4 + phosphors on the surface of a blue InGaN chip, covering 96% of National Television Standards Committee. The results indicate that the obtained composites could be promising luminescent materials for backlit displays. The incorporation of CsPbBr3 nanocrystals into porous AlO(OH) matrixes has been demonstrated to be an efficient approach for improving the nanocrystal stability. The as-prepared composites exhibited the emission at 522 nm, the full width at half-maximum as 26 nm and photoluminescence quantum yield as 52%, which would guarantee their potential application in backlit display. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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