Using energy transfer to obtain warm white-emitting and thermally stable Ca3Y(AlO)3(BO3)4:Dy3+, Eu3+ phosphors

A novel single-phase color tunable LiYGeO4:Dy3+, Eu3+ phosphor exhibiting warm white light and excellent thermal stability

“…The existence of energy transfer is determined by measuring the lifetime changes of different luminescence centers. 40 The results show that the double exponential function can well match all luminescence lifetime curves: 41 where A 1 and A 2 are the fitting coefficients, t is the time, I is the luminous intensity, and τ 1 and τ 2 are the attenuation time components, respectively. The following formula is used to calculate the average decay lifetime:…”

“…The existence of energy transfer is determined by measuring the lifetime changes of different luminescence centers. 40 The results show that the double exponential function can well match all luminescence lifetime curves: 41…”

Stable color-tunable Ca3Y(GaO)3(BO3)4:Bi3+/Tb3+/Eu3+ phosphors for application in n-UV-pumped wLEDs

“…, as the high-quality host. 7–16 To enable more dopants (RE/TM ions) to be incorporated concurrently and maintain the charge balance, the robust host CYGB with richer cationic sites, obtained by simultaneously replacing heterovalent CO 3 2− (Ca 2+ ) with BO 3 3− (Y 3+ ) and equivalent permutation of Mn 3+ with Ga 3+ from the prototype Ca 4 (Mn III O) 3 (BO 3 ) 3 CO 3 , is reasonably selected as the host in this work. In CYGB, [GaO 6 ] octahedron share edges to form chains along c , while in the ab plane the [GaO 6 ] chain is linked by triangular [BO 3 ] and the Kagomé-type structure is stacked (Fig.…”

“…12) (blue-red), and white light-emitting codoped Ca 3 Y(AlO) 3 (BO 3 ) 4 :Dy 3+ /Eu 3+ (ref. 14 and 15) and tridoped Ca 3 YAl 3 B 4 O 15 :Ce 3+ /Tb 3+/ Sm 3+ . 16 However, although tremendous efforts have been devoted to improve the PL properties in this series of phosphors, there are still a lot of rooms for further improvements and progresses, such as synthesis conditions, synergistic effects among (co)dopants ( i.e.…”

Concentration quenching inhibition and fluorescence enhancement in Eu3+-doped molybdate red phosphors with two-phase mixing

“…It is reported that the probability of successful replacement of luminescent centers depends on the degree of difference in ion radius. The formula is as follows: 33 where R 1 represents the ionic radii of In 3+ and R 2 represents the ionic radii of Eu 3+ . According to formula (1), D 1 = 18.4%, D 2 = 13.7%, are all below 30%, representing the possibility of Eu 3+ and In 3+ effectively occupying two different structures.…”