16 February 2017 Broadband white emitting amorphous yttrium-aluminum-borate phosphors for high CRI w-LEDs
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Abstract
Majority of w-LEDs (white light emitting diodes) are based on InGaN blue-LED associated with phosphors exhibiting complementary color emissions to generate required white light output. However, such complementary color mixing with the lack of violet and mainly orange-red color results in poor color-rendering index (CRI). To achieve better resolution of natural white color, recent trends on w-LEDs are focused on broadband visible emitting phosphors excitable with near UV or violet LEDs. Here, we present novel amorphous yttrium-aluminum-borate (g-YAB) phosphors exhibiting broad visible emission under UV-violet excitations. These g-YAB phosphors show high internal quantum yields (~90 %) under 365 nm excitation, possess good thermal stability over 200°C and maintains the performance for continuous and repeated operations that are ideal for the development of near UV-violet excitable w-LEDs with high color rendering ability.
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Atul D. Sontakke, M. Salaün, V. F. Guimarães, A. Ferrier, L. Maia, I. Gautier-Luneau, B. Viana, A. Ibanez, "Broadband white emitting amorphous yttrium-aluminum-borate phosphors for high CRI w-LEDs", Proc. SPIE 10124, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXI, 1012409 (16 February 2017); doi: 10.1117/12.2253104; https://doi.org/10.1117/12.2253104
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