دورية أكاديمية
Efficient sky-blue perovskite light-emitting diodes via photoluminescence enhancement
| العنوان: | Efficient sky-blue perovskite light-emitting diodes via photoluminescence enhancement |
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| المؤلفون: | Wang Q, Wang X, Yang Z, Zhou N, Deng Y, Zhao J, Xiao X, Rudd P, Moran A, Yan Y, Huang J |
| المصدر: | Nature Communications, 10(1) |
| بيانات النشر: | Nature Research |
| سنة النشر: | 2019 |
| المجموعة: | Carolina Digital Repository (UNC - University of North Carolina) |
| مصطلحات موضوعية: | photoluminescence, Photoluminescence Spectroscopy, spectroscopy, energy efficiency, crystallization, density functional theory, ultraviolet visible spectrophotometry, polystyrenesulfonic acid, electroluminescence spectrum stability test, transient absorption spectroscopy, Article, fabrication, luminescence, yttrium, perovskite, conductance, inductively coupled plasma mass spectrometry, quantum mechanics, spectrofluorometry, X ray photoemission spectroscopy, scanning electron microscopy, investigative procedures |
| الوصف: | The efficiencies of green and red perovskite light-emitting diodes (PeLEDs) have been increased close to their theoretical upper limit, while the efficiency of blue PeLEDs is lagging far behind. Here we report enhancing the efficiency of sky-blue PeLEDs by overcoming a major hurdle of low photoluminescence quantum efficiency in wide-bandgap perovskites. Blending phenylethylammonium chloride into cesium lead halide perovskites yields a mixture of two-dimensional and three-dimensional perovskites, which enhances photoluminescence quantum efficiency from 1.1% to 19.8%. Adding yttrium (III) chloride into the mixture further enhances photoluminescence quantum efficiency to 49.7%. Yttrium is found to incorporate into the three-dimensional perovskite grain, while it is still rich at grain boundaries and surfaces. The yttrium on grain surface increases the bandgap of grain shell, which confines the charge carriers inside grains for efficient radiative recombination. Record efficiencies of 11.0% and 4.8% were obtained in sky-blue and blue PeLEDs, respectively. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | https://doi.org/10.17615/z7z2-v274Test; https://cdr.lib.unc.edu/downloads/70795m322?file=thumbnailTest; https://cdr.lib.unc.edu/downloads/70795m322Test |
| DOI: | 10.17615/z7z2-v274 |
| الإتاحة: | https://doi.org/10.17615/z7z2-v274Test https://cdr.lib.unc.edu/downloads/70795m322?file=thumbnailTest https://cdr.lib.unc.edu/downloads/70795m322Test |
| رقم الانضمام: | edsbas.9AB0C571 |
| قاعدة البيانات: | BASE |
| DOI: | 10.17615/z7z2-v274 |
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