On the combination of praseodymium and cerium, a new concept of improving orange-red luminescence

Urea Glass Route as a Way to Optimize YAGG:Ce3+,Cr3+,Pr3+ Nanocrystals for Persistent Luminescence Applications

“…From the profile of the lifetime Ce 3+ emission, it can be seen that increasing annealing temperatures has a slight impact on decreasing lifetime, which is related to crystalline size and has no significant effect on the energy transfer to Pr 3+ and Cr 3+ . The average lifetime for Pr 3+ coincides with the values previously obtained for the garnet matrix 58 and confirms the affiliation of this band to the 1 D 2 → 3 H 4 transition. At the same time, it is worth noting that the lifetime may depend on many factors, and as we can see at annealing temperatures from 900 to 1100 °C, the number of hydroxyl groups, 30 which are the quenching centers, decreases but at the same time the so-called effective refractive index, which affects the rate of radiation processes from lanthanide ions, increases.…”

Red Emitting Cerium(III) and Versatile Luminescence Chromaticity of 1D‐Coordination Polymers and Heterobimetallic Ln/AE Pyridylpyrazolate Complexes

“…Either organic melt or solvothermal synthesis-based reactions of 3-(2-pyridyl)pyrazole (2-PyPzH) (Scheme 1) with elemental lanthanides were used to obtain a series of ten coordination polymers 1 ∞ [Ln(2-PyPz) 3 ], Ln=La (1), Ce (2), Pr (3), Nd (4), Sm ( 5), Eu (6), Gd (7), Tb (8), Dy (9), and Ho (10). Solvothermal reactions of 2-PyPzH with a mixture of elemental Tb and AE yielded three complexes [Tb 2 AE(2-PyPz) 8 ], AE=Ca (11), Sr (12), and Ba (13), while the reaction with elemental alkaline earth metal obtained two complexes [AE(2-PyPz) 2 (2-PyPzH) 2 ], AE=Ca (14), and Sr (15).…”

“…[7] The emissive Ce 3 + examples in the literature are mainly near UV and blue emitters [8] beside some doped materials exhibiting green/yellow [9] or even the unusual yellow emission. [10] Recently, the red emission in solid state LEDs was within the scope of Ce/ Pr systems, such as Lu 3 Al 5 O 12 : Ce 3 + Pr 3 + , [11] YAG : Ce 3 + Pr 3 + , [12] Gd 3 Ga 5 O 12 : Ce 3 + Pr 3 , [13] Y 3 Al 5 O 12 : Ce nanophosphor doped with Pr 3 + , [14] and the cerium-doped scandate. [15] We now present an undoped Ce 3 + red phosphor, which indicates the value of investigating new N-donor based ligands and coordination compounds to achieve a high variety of photoluminescence of the lanthanides.…”

Insights into the Relationship between Crystallite Size, Sintering Pressure, Temperature Sensitivity, and Persistent Luminescence Color of Gd2.97Pr0.03Ga3Al2O12 Powders and Ceramics

“…4,5 Even now, lots of new research are being carried out in this area, and as such recently a new concept for the improvement of orangered emission based on the Pr 3+ /Ce 3+ combination has been presented. 6 From all of the aforementioned compound groups, garnets in particular have attracted the attention of researchers due to their chemical stability, 7 high quantum efficiency of rare-earth (RE)-doped structures, 8 and possibility of tuning optical properties by cationic substitution. 9 The most wellknown and studied garnet structures are YAG, 10,11 LuAG, 12 and GGG.…”

“…The aforementioned emission color allows for various applications, such as in electronics, warning signs, LED displays, or medicine. Furthermore, the Pr ion is very often used as an admixture in various compound groups such as perovskites, phosphates, , or garnets. , Even now, lots of new research are being carried out in this area, and as such recently a new concept for the improvement of orange-red emission based on the Pr 3+ /Ce 3+ combination has been presented . From all of the aforementioned compound groups, garnets in particular have attracted the attention of researchers due to their chemical stability, high quantum efficiency of rare-earth (RE)-doped structures, and possibility of tuning optical properties by cationic substitution .…”