کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5403198 | 1392753 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
InGaN/bivalent fluorescein salt luminescence conversion light-emitting diode: Stability and photochemical reaction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: InGaN/bivalent fluorescein salt luminescence conversion light-emitting diode: Stability and photochemical reaction InGaN/bivalent fluorescein salt luminescence conversion light-emitting diode: Stability and photochemical reaction](/preview/png/5403198.png)
چکیده انگلیسی
A light-emitting diode (LED) was fabricated using a commercial InGaN LED (460Â nm) and bivalent fluorescein salt dispersed in an epoxy matrix, as a primary light source and a luminescence conversion (LUCO) material, respectively. The LUCO LED emitted white light, which faded almost completely within 1Â h when a current of 20Â mA was continuously supplied. Based on the FT-IR, UV-visible and XPS spectral data, a large portion of bivalent fluorescein salt in the epoxy matrix underwent photochemical reactions, generating neutral fluorescein on irradiation with blue light. However, when bivalent fluorescein salt was dispersed in poly(methyl methacrylate) instead of epoxy, the luminous output of the resulting LUCO LED decreased much more slowly during continuous operation. Furthermore, the chemical structure of bivalent fluorescein salt remained unaltered during irradiation with blue light when the freeze-dried salt was kept under high vacuum. It was concluded that bivalent fluorescein salt should be almost completely protected from the environment for application as a LUCO material when coupled with a blue LED.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 127, Issue 2, December 2007, Pages 665-670
Journal: Journal of Luminescence - Volume 127, Issue 2, December 2007, Pages 665-670
نویسندگان
Ji-Young Jin, Hye-Young Lee, Soo-Hyoung Lee, Seok-Bum Ko, Kyukwan Zong, Youn-Sik Lee,