Tunable color of Tb3+/Eu3+/Tm3+-coactivated K3La(PO4)2 via energy transfer: A single-phase white-emitting phosphor

Excitation‐dependent energy transfer and color tunability in Dy3+/Eu3+ co‐doped multi‐component borophosphate glasses

“…The Dy 3+ /Eu 3+ co‐doped glass sample was excited at 365 nm using a xenon arc lamp, and the spectral profile was recorded in the range of 330–750 nm. The quantum yield ( η ) is defined as the number of photons emitted by luminescence ( I em ) relative to the number of photons absorbed by the sample ( I abs ), which can be calculated using Equation () given as follows 65–67,68 : $$$$\begin{equation}\eta \ = \ \frac{{{I}_{{\rm{em}}}}}{{{I}_{{\rm{abs}}}}} = \ \frac{{\smallint {L}_{\rm{S}}}}{{\smallint {E}_{\rm{R}} - \smallint {E}_{\rm{S}}}},\end{equation}$$$$where L S represents the integrated luminescence intensity of the PL spectrum of the of KZnBP:0.5Dy 3+ /1.0Eu 3+ co‐doped glass, E R represents the integrated excitation light profile obtained with BaSO 4 as a reference (in the absence of sample), and E S represents the excitation light spectrum of the Dy 3+ /Eu 3+ glass. The quantum yield ( η ) of 0.5Dy 3+ /1.0Eu 3+ glass is 38%.…”

“…The Dy 3+ /Eu 3+ co-doped glass sample was excited at 365 nm using a xenon arc lamp, and the spectral profile was recorded in the range of 330-750 nm. The quantum yield (η) is defined as the number of photons emitted by luminescence (I em ) relative to the number of photons absorbed by the sample (I abs ), which can be calculated using Equation (10) given as follows [65][66][67]68 :…”

“…From Figure 15B, it can be seen that when the temperature was increased to 423 K (150 • C), the PL intensities of Dy 3+ and Eu 3+ ions were decreased to 51.8% and 63.5%, respectively, corresponding to the initial temperature (300 K). Furthermore, thermal quenching behavior of Dy 3+ /Eu 3+ co-doped glass was analyzed from the activation energy calculated using Arrhenius equation [65][66][67] :…”

Luminescence properties and energy transfer of Tm3+–Eu3+ double-doped LiLaSiO4 phosphors

“…Where η 0 and η are the quantum efficiency of Tm 3+ ions in the absence and presence of Eu 3+ ions, respectively, and the value of 0 / can be calculated by the ratio of luminous intensity ( 0 / ), C is the total concentration of Tm 3+ and Eu 3+ ions, n=6, 8 or 10 correspond to electric dipole-electric dipole, electric dipole-electric quadrupole, or electric quadrupole-electric quadrupole interactions, respectively [41].…”

Enhancing the Photoluminescence Property of Pr3+ Ions by Understanding the Polymorphous Influence of the K3Lu(PO4)2 Host

“…Phosphates are a class of outstanding optical hosts and have drawn increasing research interest in recent years. Besides the as-mentioned Eu 2+ :Na 3 Sc 2 (PO 4 ) 3 , K 3 RE­(PO 4 ) 2 (RE = Y, Sc, and lanthanides) is also one kind of promising phosphate host, and its crystal structure can be modified by RE 3+ ions. − Along with the alteration of RE 3+ ions, the room-temperature (RT) crystal structure of K 3 RE­(PO 4 ) 2 contains two kinds of phases, corresponding to phase I ( P 2 1 / m , RE = La to Yb, Y) and phase III ( P 3̅, RE = Lu, Sc), respectively. , Apart from the influence of ion radius, temperature is also an effective parameter for manipulating the crystal structure of K 3 RE­(PO 4 ) 2 . As depicted in Figure , K 3 Lu­(PO 4 ) 2 shows two reversible phase transitions in the temperature range from 78 to 300 K, corresponding to phase I ⇆ phase II and phase II ⇆ phase III, respectively.…”