دانلود White Light-Emitting Diodes With Enhanced Efficiency and Thermal Stability Optimized by Quantum Dots-Silica Nanoparticles

ترجمه White Light-Emitting Diodes With Enhanced Efficiency and Thermal Stability Optimized by Quantum Dots-Silica Nanoparticles
قیمت : 255,000 ریال
شناسه محصول : 2008885
نویسنده/ناشر/نام مجله : IEEE TRANSACTIONS ON ELECTRON DEVICES
سال انتشار: 2018
تعداد صفحات انگليسي : 5
نوع فایل های ضمیمه : Pdf+Word
حجم فایل : 2 Mb
کلمه عبور همه فایلها : www.daneshgahi.com
عنوان انگليسي : White Light-Emitting Diodes With Enhanced Efficiency and Thermal Stability Optimized by Quantum Dots-Silica Nanoparticles

چکیده

Abstract

White light-emitting diodes (WLEDs) composed of blue LED chip, yellow phosphor, and red quantum dots (QDs) are considered as a potential alternative for the next-generation artificial light source, with their high luminous efficiency (LE) and color-rendering index (CRI). However, the poor stability of QDs-silicone mixture and the optical reabsorption effect between the mixed QDs/phosphor particles severely hinders the wide utilization of QDs-WLEDs. Therefore, in this paper, a silica shell was coated onto the QDs surface to solve the compatibility problem between QDs and phosphor-silicone gel. Then, a QDs-on-chip packaging structure was proposed to reduce the reabsorption energy loss. The prepared QDs@silica nanoparticles (QSNs) exhibited excellent luminescent stability over bare QDs under high-temperature (85 °C) and high-relative humidity (85% RH). With CRI >90 and R9 >90, the newly proposed QSNs-WLEDs demonstrated an LE enhancement of 15.7% over conventional mixed-type WLEDs due to the less reabsorption loss. Consequently, the newly proposed QSNs-WLEDs showed 20.5 °C lower QDs working temperature under driving current of 200 mA.

Keywords: Color-rendering index luminous effi- ciency (LE) phosphor quantum dots
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