Ms. Ya Zhu Yang Profile

Ya Zhu Yang

at National Formosa Univ

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Publications (2)

Proceedings Article | 14 September 2018 Presentation + Paper

High color gamut of perovskite QDs/PMMA-based white light-emitting diode

Ya-Zhu Yang, Shu-Ru Chung

Proceedings Volume 10736, 107361G (2018) https://doi.org/10.1117/12.2320493

KEYWORDS: Polymethylmethacrylate, Perovskite, Ion exchange, Luminescence, Light emitting diodes, Ions, Cesium, Electroluminescence, Transmission electron microscopy, Quantum dots

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Proceedings Article | 24 August 2017 Presentation + Paper

The alkyl amines effect on the optical properties of inorganic perovskite quantum dot

Ya-Zhu Yang, Shu-Ru Chung

Proceedings Volume 10348, 103480U (2017) https://doi.org/10.1117/12.2273265

KEYWORDS: Quantum dots, Carbon, Light emitting diodes, Ions, Atmospheric particles, Optical properties, Optoelectronics, Solar cells, Cesium, Carbonates

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Perovskite quantum dots (P-QDs) is a new kind of optoelectronic materials in recent years. Compared with organic perovskite QDs (MAPbX3), inorganic perovskite QDs (CsPbX₃) have a better stability. Inorganic P-QDs can be prepared at low temperature. Those novel QDs can be applied in solar cells, light-emitting diodes (LEDs), display, and biolables. Typical synthesis process to prepare CsPbX₃ QDs is used oleic acid (OA) and cesium carbonate (Cs₂CO₃) to form Cs-oleate complex first. Moreover, the oleylamine (OLA) and octadecene (ODE) are used as capping agents. Cs-oleate complex then reacts with PbX₂ to form CsPbX₃ QDs (reacts for 5 s). As we know that the CsPbBr₃ QDs emits green light, and its emission wavelength can be tuned by adding Cland Iions to replace Brion. However, the reaction rate of CsPbX₃ QDs is fast, and it is not easy to control the emission wavelength by particle size. In this study, we use the saturated alkyl amines with difference of carbon chain length such as dodecylamine (DDA), hexadecylamine (HDA), and octadecylamine (ODA) to prepare CsPbBr3 QDs. The result shows that the emission spectra for all samples range from 489 (ODA) to 514 nm (DDA), the full width at half-maximum (FWHM) is between 23 to 28 nm, the surface morphologies of all samples are nearly spherical, and the quantum yields (QYs) are higher up to 130 % (compared with R6G and the excitation wavelength is 450 nm). Based on emission spectra we can find that the emission peaks are fixed even under different excitation wavelength, imply that the particle size distribution of QDs is uniform. Moreover, the emission wavelength blue shifts with increasing carbon chain length of amines. The stability of alkyl amine-capped CsPbBr₃ QDs is good, especially for DDA-capped sample. We also find that a small emission peak around 462 nm can be only observed for DDA-capped sample. Furthermore, this small peak also can be observed even prolong the reaction time to 10 min. The emission wavelengths of CsPbBr₃ QDs can be controlled by carbon chain length of alkyl amines. The small FWHM and high QYs of CsPbBr₃ QDs meaning that it is benefit to enhance the color gamut of display.

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