Development of perovskite-based light emitting diodes with improved stability 1.0
The discovery of organic-inorganic lead halide perovskite luminating under ultraviolet excitation and its excellent optoelectronic properties led to the increased in studies of the fundamental understanding and its potential application. As such, more researches were invested in manufacturing at a l...
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| Format: | Final Year Project (FYP) |
| Language: | English |
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2019
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| Online Access: | http://hdl.handle.net/10356/77797 |
| _version_ | 1824453741955252224 |
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| author | Sim, Zong Huan |
| author2 | Yong Ken Tye |
| author_facet | Yong Ken Tye Sim, Zong Huan |
| author_sort | Sim, Zong Huan |
| collection | NTU |
| description | The discovery of organic-inorganic lead halide perovskite luminating under ultraviolet excitation and its excellent optoelectronic properties led to the increased in studies of the fundamental understanding and its potential application. As such, more researches were invested in manufacturing at a low cost and at a larger scale for industrial applications. In this report, the synthesis of colloidal cesium-lead halide (CsPbX3) perovskite NCs via microwave irradiation were discussed. The stability of the perovskite NCs were improved by varying the combination of halide ions and the type of capping ligands (oleic acid and stearic acid) used. Characterisation of the perovskite NCs were made by measuring its absorbance and fluorescence intensity. These synthesized perovskite NCs were subjected to thermal degradation and its fluorescence intensity were measured. The rate of decrease in intensity indicates the stability of the NCs. Quantum yield was further calculated using the sample and a reference compound for a more quantitative characterisation. The stearic acid (SA)-capped having higher melting point property reduces tendency of SA leaving the crystal surface, preventing aggregation between perovskite NCs and improving its stability as compared to oleic acid (OA)-based. |
| first_indexed | 2025-02-19T03:11:15Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/77797 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:11:15Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/777972023-07-07T15:56:36Z Development of perovskite-based light emitting diodes with improved stability 1.0 Sim, Zong Huan Yong Ken Tye School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering The discovery of organic-inorganic lead halide perovskite luminating under ultraviolet excitation and its excellent optoelectronic properties led to the increased in studies of the fundamental understanding and its potential application. As such, more researches were invested in manufacturing at a low cost and at a larger scale for industrial applications. In this report, the synthesis of colloidal cesium-lead halide (CsPbX3) perovskite NCs via microwave irradiation were discussed. The stability of the perovskite NCs were improved by varying the combination of halide ions and the type of capping ligands (oleic acid and stearic acid) used. Characterisation of the perovskite NCs were made by measuring its absorbance and fluorescence intensity. These synthesized perovskite NCs were subjected to thermal degradation and its fluorescence intensity were measured. The rate of decrease in intensity indicates the stability of the NCs. Quantum yield was further calculated using the sample and a reference compound for a more quantitative characterisation. The stearic acid (SA)-capped having higher melting point property reduces tendency of SA leaving the crystal surface, preventing aggregation between perovskite NCs and improving its stability as compared to oleic acid (OA)-based. Bachelor of Engineering (Electrical and Electronic Engineering) 2019-06-06T07:27:05Z 2019-06-06T07:27:05Z 2019 Final Year Project (FYP) http://hdl.handle.net/10356/77797 en Nanyang Technological University 37 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering Sim, Zong Huan Development of perovskite-based light emitting diodes with improved stability 1.0 |
| title | Development of perovskite-based light emitting diodes with improved stability 1.0 |
| title_full | Development of perovskite-based light emitting diodes with improved stability 1.0 |
| title_fullStr | Development of perovskite-based light emitting diodes with improved stability 1.0 |
| title_full_unstemmed | Development of perovskite-based light emitting diodes with improved stability 1.0 |
| title_short | Development of perovskite-based light emitting diodes with improved stability 1.0 |
| title_sort | development of perovskite based light emitting diodes with improved stability 1 0 |
| topic | DRNTU::Engineering::Electrical and electronic engineering |
| url | http://hdl.handle.net/10356/77797 |
| work_keys_str_mv | AT simzonghuan developmentofperovskitebasedlightemittingdiodeswithimprovedstability10 |