White Light Emission and Enhanced Color Stability in a Single-Component Host

Abstract

Eu ion can be effectively sensitized by Ce ion through an energy-transfer chain of Ce-(Tb) -Eu, which has contributed to the development of white light-emitting diodes (WLEDs) as it can favor more efficient red phosphors. However, simply serving for WLEDs as one of the multicomponents, the design of the Ce-(Tb) -Eu energy transfer is undoubtedly underused. Theoretically, white light can be achieved with extra blue and green emissions released from Ce and Tb. Herein, the design of the white light based on these three multicolor luminescence centers has been realized in GdBO. It is the first time that white light is generated via accurate controls on the Ce-(Tb) -Eu energy transfer in such a widely studied host material. Because the thermal quenching rates of blue, green, and red emissions from Ce, Tb, and Eu, respectively, are well-matched in the host, this novel white light exhibits superior color stability and potential application prospect.

Tunable dual‐mode emission with excellent thermal stability in Ca4ZrGe3O12:Eu phosphors prepared in air for NUV‐LEDs

“…More importantly, the CIE coordinates of CZGO:0.16Eu excited by 393 (Figure C) and 370 nm (Figure F) light are almost unchanged even up to 423 K. The color stability can be quantifiably defined as the chromaticity shift ( △E ) employing the formula ,where uʹ = 4x/(3 − 2x + 12y) , vʹ = 9y/(3 − 2x + 12y), and wʹ = 1 − uʹ − vʹ . uʹ and vʹ correspond to the chromaticity coordinates in uʹvʹ uniform color space, x and y signify the chromaticity coordinates, as well as 0 and t represent the chromaticity shift at initial and different temperatures, respectively.…”

Tunable lanthanide/transition metal ion‐doped novel phosphors for possible application in w‐LEDs: a review

“…Li et al . reported white‐light generation via accurate controls on Ce 3+ –(Tb 3+ ) n –Eu 3+ by phonon‐assisted energy transfer in GdBO 3 host material . Excitation of Ce 3+ was not so strong, Tb 3+ played a major role in energy absorption.…”

A slight bluish-white fluorescence from E,E-2,6-bis(4-cyanostyryl)pyridine pristine crystals

“…Materials emitting multicolour light, such as white-lightemitting materials, are of great interest for displays and illumination devices. [1][2][3][4][5] Multicolour illumination usually requires multiple light sources; however, a singular light source would be efficient from the viewpoint of device structure. In particular, if a single organic light emitter compound can emit white light, such a compound will be in great demand.…”