کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1528523 1511973 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tuning the diurnal natural daylight with phosphor converted white LED – Advent of new phosphor blend composition
ترجمه فارسی عنوان
تنظیم نور روزانه نور روز با چراغ سفید تبدیل فسفر؟ ظهور ترکیبی ترکیب فسفر جدید
کلمات کلیدی
نور روز طبیعی، مخلوط فسفر، طیف کامل
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی


• Designed phosphor blend that mimics diurnal daylight for health benefits.
• Developed new phosphor blend composition that mimics natural sunlight under near UV.
• The phosphor blend also exhibits high CRI (≥90) under blue LED excitation.
• Fabricated WLED exhibited ∼91% spectral resemblance with daylight at 4500 K.
• While ∼39.2% spectral resemblance were observed for YAG:Ce3+ at 4500 K.

We demonstrate the feasibility of developing phosphor converted white LED (pc-WLED) that mimics diurnal natural daylight with the newly designed phosphor blend in the color temperature (CCT) 2700–6000 K for health benefits. Natural daylight (sunlight) spectrum possesses broad emission in the visible region and closely approximates black body radiator, with color rendition index (CRI) of 100 under wide CCT (2500–6500 K). Current white light LEDs although are efficient and durable, they are not broad enough compared to daylight. We report new phosphor blend based on Sr3MgSi2O8:Eu2+ blue phosphor with broad emission and high CRI ≥ 96 under both near UV and blue excitation. The fabricated WLED has exhibited ∼91% spectral resemblance with natural daylight compared to 39.2% for YAG:Ce3+ white LED at 4500 K. The developed phosphor blend tunes the spectrum in wider CCT and would be a prospective candidate for full spectrum daylight WLED.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 193, March 2015, Pages 4–12
نویسندگان
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