Novel Eu³⁺-activated Ba₂Y₅B₅O₁₇ red-emitting phosphors for white LEDs: high color purity, high quantum efficiency and excellent thermal stability

A novel scheelite‐type LiCaGd(WO4)3:Eu3+ red phosphors with prominent thermal stability and high quantum efficiency

“…The measuring principle of quantum efficiency can be expressed by the following equation 39,40 : $$$$\begin{equation}{\eta _{QE}} = \frac{{\int {{L_S}} }}{{\int {{E_R} - \int {{E_S}} } }},\end{equation}$$$$where L S is the PL spectrum of the phosphor, and E S and E R denote the PLE light with and without the phosphor in the integrating sphere, respectively. Under the 395 nm PLE, the quantum efficiency of LCGWO: x Eu 3+ phosphors rises gradually with Eu 3+ doping concentration, and it reaches 94.2% when x = 1.0, which is higher than Ba 2 Y 5 B 5 O 17 :Eu 3+ (47.2%), 41 K 5 Bi(Mo x W 1‐ x O 4 ) 4 :Eu 3+ (45.7%), 42 Li 3 Ba 2 La 3 (WO 4 ) 8 :Eu 3+ (53%), 43 and NaGd(WO 4 ) 2 :Eu 3+ (67.2%) 44 . Thus, LCGWO: x Eu 3+ phosphors with a high doped concentration can be proved to have excellent luminescence property and high efficiency.…”

Mn4+-activated BaLaMgSbO6 double-perovskite phosphor: a novel high-efficiency far-red-emitting luminescent material for indoor plant growth lighting

“…The emission intensity at 423 K (150 C) remained 37% of that at 303 K (30 C). Moreover, the activation energy (E a ) was calculated via the equation, which is expressed as follows: 63,64 ln…”

Structural and photoluminescent features of Eu3+ activated single‐phase niobate phosphor for lighting applications

“…Among various rare‐earth (RE) ions, Eu 3+ , Pr 3+ , and Sm 3+ are mostly employed for synthesizing red/orange–red phosphors owing to their 4f–4f transitions emitting in the specific spectral region. Out of them, trivalent europium (Eu 3+ ) ions are popularly used as red‐emitting phosphors, due to its characteristic f–f transitions in the orange and red regions, respectively 7–9 …”

“…Out of them, trivalent europium (Eu 3+ ) ions are popularly used as red-emitting phosphors, due to its characteristic f-f transitions in the orange and red regions, respectively. [7][8][9] Among many hosts, niobates have been attracted as potential candidates for their huge multiplicity in crystal structures owing to the complex assortment in niobium coordination. The compounds related with niobates were widely explored for the reason of their efficient ferroelectric, photoluminescence (PL), and energy storage properties.…”