Broadband white emitting amorphous yttrium-aluminum-borate phosphors for high CRI w-LEDs

摘要

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.