White Light-Emitting Diodes With High Color Quality Fabricated Using Phosphor-in-Glass Integrated With Liquid-Type Quantum Dot

In this letter, high-quality white light-emitting diodes (WLEDs) were fabricated by combining a YAG:Ce
³⁺
phosphor-in-glass (PiG) with a red liquid-type quantum dot (LQD). The PiG_LQD-based WLEDs achieve a warm white light with an excellent color rendering index (CRI; Ra = 93.9, R9 = 97.7, and R13 = 98.1) at the current of 100 mA. The corresponding correlated color temperature and luminous efficacy (LE) are 3764 K and 62 lm/W, respectively. In comparison with the PiG integrated with solid-type QD, the PiG_LQD exhibits high LE, excellent CRI, and low surface temperature due to the prevention of self-aggregation and surface defects of QDs in the solid state and the efficient heat dissipation of PiG_LQD. The results indicate that the fabricated WLEDs are promising lighting devices for high-quality lighting applications.