Using Green Emitting Phosphor for Improving Lighting Performance of In-cup Package White LED Lamps

Abstract

LED technology had a huge development in recent years with major benefits: long-life, high-efficiency, excellent performance, compactness. In this work, an innovative method for improving the performance of multi-chip white LED lamps (MCW-LEDs) by adding the green Ce 0.67 Tb 0.33 MgAl 11 O 19 :Ce,Tb (CeTb) phosphor to their in-cup phosphor compounding is proposed, investigated and demonstrated. Firstly, CeTb was mixed to the incup phosphor package of MCW-LEDs. Then by varying CeTb concentration, lumen output and angular color uniformity (ACU) of MCW-LEDs was calculated and analyzed. The results showed that the lumen output and the ACU of 7000 K and 8500 K MCW-LEDs increased significantly in comparison with others related works. This method is a prospective ideal for future improving LED manufacture.

Influence of Ca[Mg3SiN4]Ce3+ phosphor’s concentration on optical properties of the 5600K RP-WLEDs

“…In this simulation, the concentration of Ca[Mg3SiN4]Ce 3+ should be varied continuously from 10% to 30% for selecting a proper concentration. The optical properties of Ca[Mg3SiN4]Ce 3+ particles are configured by using the Light Tools software based on Mie-theory as in [13,[18][19][20][21][22][23][24][25]. The scattering coefficient μscattering(λ), anisotropy factor g(λ), and reduced scattering coefficient δsca(λ) can be formulated as:…”

“…The reduced scattering coefficients of Ca[Mg3SiN4]Ce 3+ at 453 nm, 555 nm, and 680 nm wavelengths grow with Ca[Mg3SiN4]Ce 3+ concentration, as shown in Figure 4. The deviations of the reduced scattering coefficients among three wavelengths are the same values [13,[18][19][20][21][22] From Figure 5, we can state that the CRI rises from 64 to 74, while the concentration of the phosphor varies from 10 to 30%. In the same way, the CQS increases from 63.5 to 69.5 while the concentration of the phosphor varies from 10 to 30% are plotted in Figure 6.…”

“…In this model, RP-WLEDs have been c configured as in previous studies. The main parameters of the 5600K RP-WLEDs can be conducted as in [13].…”

“…In [9][10][11][12], the effect of phosphor location on the spatial color distribution was investigated. Moreover, some researchers were concentrated on enhancing the optical performance of multichip white LEDs (MCW-LEDs) by adding green or red phosphor into the phosphor layer [13][14][15][16][17].…”