Composite structure Cr:YAG/Ce:YAG and (Ce,Cr):YAG/Ce:YAG transparent ceramics with high color rendering index for white LEDs/LDs

High color rendering and high-luminance laser lighting using all inorganic nitride phosphor films

“…In some previous studies, red emission was introduced by the addition of red-emitting ions such as Gd 3+ , Gr 3+ and Pr 3+ in YAG:Ce. [36][37][38][39] Among them, the CRI value for Ce:GdYAG is slightly better than the other two candidates. 40 In the meantime, the yellow phosphor LSN:Ce that exhibits a wide spectral emission peak has a CRI value of just 74.9 aer being encapsulated as a PiG-F. 41 It is extremely difficult to obtain a high CRI value based on just a single phosphor under laser light illumination.…”

Effect of surface treatment upon luminous efficiency of YAG: Ce ceramics

“…However, the light emitting efficiency of WLEDs with glass‐ceramic packaging devices was low, 24 there were scattering and corrosion problems at the interface between the phosphors and the glass substrate, and the thermal conductivity of glass was much lower than that of ceramics, which limited the application in high‐power LEDs. YAG: Ce transparent ceramics were considered to be the most promising candidates with excellent optical properties and high thermal conductivity compared with other alternative materials 25–27 …”

Novel composite color converters based on Tb1.5Gd1.5Al5O12:Ce single crystalline films and Y3Al5O12:Ce crystal substrates

“…To improve the luminescence and photoconversion performance of YAG:Ce phosphor, several kinds of approaches have been proposed by researchers including the supplement of the red component by Eu 3+ and Cr 3+ doping, 6,7 the red-shift emission of Ce 3+ by Mn 2+ -Si 4+ pair codoping, 8 etc. The listed co-doping ions are unsuitable for exciting the efficient luminescence by the blue LED directly, requiring UV excitation.…”