Dopant and excitation wavelength dependent color tunability in Dy3+ and Eu3+ doped CaBi2B2O7 phosphors for NUV warm white LEDs

Dy3+ → Eu3+ Energy Transfer in SrLaGa3O7:Dy3+/Eu3+ Phosphors

“…These luminescence characteristics are similar to the characteristics of other Dy 3+ /Eu 3+ codoped phosphors. [10][11][12] Meanwhile, we find that the Eu 3+ emission intensity in SrLaGa 3 O 7 :0.04Dy 3+ /0.02Eu 3+ is ∼1.18 times of that of SrLaGa 3 O 7 :0.02Eu 3+ . The continuous reduction of Dy 3+ emission intensity in SrLaGa 3 O 7 :0.04Dy 3+ / xEu 3+ and the higher Eu 3+ emission intensity in SrLaGa 3 O 7 : 0.04Dy 3+ /0.02Eu 3+ than that of SrLaGa 3 O 7 :0.02Eu 3+ are induced by Dy 3+ → Eu 3+ energy transfer.…”

“…The broad band in the shorter wavelength region is a CTB induced by the O 2− → Dy 3+ charge transfer absorption, but other bands come from the f → f transitions of Dy 3+ . 6,11 All of the transitions are distinguished and signaled detailedly in the left spectrum of Fig. 2B.…”

“…Up to now, some energy transfer processes have been reported, such as Ce 3+ → Eu 2+ , 7 Ce 3+ → Tb 3+ , 8 Tb 3+ → Eu 3+9 and Dy 3+ → Eu 3+ . [10][11][12] The phosphor with down-conversion emission is one of key components for white light emitting diodes. The white light emitting diodes are regarded as the outstanding and environmentally-friendly solid state lighting source by reason of the remarkable characteristics of high energy efficiency, longevity and pro-environment.…”

Color-tunable luminescence, energy transfer behavior and I–V characteristics of Dy3+,Eu3+ co-doped La(PO4) phosphors for WLEDs and solar applications

“…These results suggest that the proposed phosphor is suitable for WLEDs application. Color correlated temperature (CCT) is also an important parameter to 44 The CCT value can be determined using the following equation: 45 CCT = À499n 3 + 3525n 2 À 6823.3n + 5520.33 (4) and,…”

“…In the modern era, white LEDs (WLEDs) have attracted tremendous research attention in the lighting industry because of their amazing features like high energy efficiency, long operation lifetime, low power consumption, compact size and environmental friendliness etc. [1][2][3][4] In the past two decades, much effort has been devoted to the investigation of novel inorganic rare earth activated materials and the fabrication of WLEDs. The widespread popularity of WLEDs has proved that they will be the most widely used light source in upcoming years.…”