Improving the Optical Properties of the 8500, K In-cup Packaging WLEDs by Using the Green-emitting CaF2:Ce 3+, Tb 3+ Phosphor


Quang Minh T.H., Vu L.A.

Source title

Lecture Notes in Electrical Engineering

Publication year

In last few decades, Light emitting diode (LED) with a series of excellence advantages is considered as the next generational light source. In this research, by co-doping the Green-emitting CaF2:Ce3+, Tb3+ phosphor to yellow-emitting YAG:Ce phosphor compound, an innovative approach for improving optical properties of the 8500 K in-cup phosphor packaging white LED lamps (WLEDs) is proposed, investigated, and demonstrated. By using Mie Theory with Mat Lab and Light Tool software, the obtained results show that the optical properties of the 8500 K in-cup phosphor packaging WLEDs is significantly influenced by the Green-emitting CaF2:Ce3+, Tb3+ phosphor’s concentration. From the research results, the correlated color temperature deviation (D-CCT) decreased from 9200 K to 3700 K, and the luminous flux increased from 940 lm. to 1500 lm., respectively. The results indicated that the green-emitting CaF2:Ce3+, Tb3+ phosphor could be considered as a potential solution for manufacturing the in-cup packaging phosphor WLEDs with high CCT shortly.