Alviani, A Marsha (2018) Preparasi dan karakterisasi glassy Ce3+ dan Mn2+- doped CaAl2O4 powder dengan metode spray pyrolysis. Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Inorganic luminescence material atau biasa disebut dengan phosphor telah diaplikasikan secara luas seperti security label, emergency signalling, solid state, dan laser light-emitting diodes (LEDs). Saat ini, phosphor sebagai security label dapat ditemukan di uang, paspor, dan beberapa kertas penting. Sebagai tambahan, Shih et al, menerangkan terkait amorfus gehlenite sebagai material phosphor yang memiliki distribusi partikel yang baik. Selain itu untuk membandingkan aplikasi dengan fasa amorfus, glassy phosphor akan diteliti lebih lanjut dalam riset ini. Dalam penelitian ini, calcium aluminate (CaAl2O4) digunakan karena memiliki beberapa karakteristik seperti long after glow time, stabilitas kimia yang baik, tidak beracun, harga murah, dan efisiensi kuantum yang tinggi pada visible region. Dalam penelitian ini Ce3+, Mn2+ doped with CaAl2O4 dibuat menjadi fasa amorfus. Annealing temperature pada 800oC pada 95%N2/ 5%H2 digunakan untuk mereduksi Ce4+ menjadi Ce3+ dan Mn4+ menjadi Mn2+. Untuk mendapatkan fasa CaAl2O4:Ce3+, Mn2+ , terdapat beberapa karakterisasi yang dilakukan. Seperti, X-ray diffraction (XRD). Untuk mengetahui morfologi permukaan digunakan scanning electron microscopy (SEM). Selain itu untuk mengetahui sifat photoluminescecne menggunakan alat photoluminescence spectra (PL), karakterisasi panjang gelombang yang digunakan pada 273 nm. Maksimum komposisi untuk meningkatkan intensitas dari sinar biru-hijau adalah 0.5%Ce3+ and 1%Mn2+ in CaAl2O4.
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Inorganic luminescent materials (also known as phosphors), have been extensively studied in numerous application such as security label, emergency signalling, solid state, and laser light-emitting diodes (LEDs). Nowadays, phosphor for security labels can be found in money, passport, and other important paper. In addition, Shih et al determined that amorphous gehlenite phosphor material have a good activator particle distribution. Therefore, as compared to the application and amorphous phase superiority, glassy phosphor will be further investigated in this study. In this research calcium aluminate (CaAl2O4) is used because it has special characteristics such as long after glow time, good chemical stability, low toxicity, low cost, and high quantum efficiency in the visible region. In this study, Ce3+, Mn2+ doped with CaAl2O4 were synthesized with amorphous phase. Annealing temperature at 800oC in 95%N2/ 5%H2 condition was used to reduce Ce4+ to Ce3+ and Mn4+ to Mn2+. The obtained phosphor CaAl2O4:Ce3+, Mn2+ phase was characterized by X-ray diffraction technique (XRD). The surface morphology was determined by scanning electron microscopy (SEM). Also photoluminescence spectra (PL), characterization were done with excitation at 273 nm. The maximum composition to increase the intensity of the blue-green light is 0.5%Ce3+ and 1%Mn2+ in CaAl2O4.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Calcium aluminate, Ce/Mn, luminescence, amorphous |
| Subjects: | Q Science > QC Physics > QC475 Photoluminescence T Technology > T Technology (General) |
| Divisions: | Faculty of Industrial Technology > Material & Metallurgical Engineering > 27101-(S2) Master Thesis |
| Depositing User: | A Marsha Alviani |
| Date Deposited: | 02 Aug 2021 21:46 |
| Last Modified: | 02 Aug 2021 21:46 |
| URI: | http://repository.its.ac.id/id/eprint/58096 |
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