Investigation of up-conversion luminescence properties of RE/Yb co-doped Y2O3 transparent ceramic (RE=Er, Ho, Pr, and Tm)

Improving pure red upconversion emission of Co-doped Y2O3:Yb3+–Er3+ nanocrystals with a combination of sodium sulfide and surfactant Pluronic-F127

“…UC of Er 3+ -doped nanoparticles sensitized with Yb 3+ has been widely studied in oxide ceramics such as Y 2 O 3 [11,25,26], yttrium aluminum garnet (YAG) [27,28], ZnO [29], ZrO 2 [21,30] and LaF 3 [31,32]. However, the most efficient upconverting phosphors are yttrium-based inorganic crystals, such as yttrium oxide (Y 2 O 3 ) [11,33], yttrium fluoride (YF 3 ) [34], yttrium oxysulfide (Y 2 O 2 S) [34][35][36], and sodium yttrium fluoride (NaYF 4 ) [37,38].…”

Infrared to infrared upconversion emission in Pr3+/Yb3+ co-doped La2O3 and La(OH)3 nano-phosphors: A comparative study

“…They give efficient up and downconversion emissions due to 4f-4f and 4f5d-4f electronic transitions. Most of the earlier work based on upconversion process report a conversion of infrared light to visible or visible to ultraviolet (UV) light [12][13][14][15][16][17][18]. Only in few reports the upconversion in infrared to infrared regions have been observed [12,16,19].…”

“…The Pr 3+ ion has distinguished features of transitions in blue [12][13][14]16,23,24], green [12,13,17,18,23], red [4,12,15,25,26] and infrared regions [12,16,19], which are strongly host dependent. In fact, Pr 3+ ion is known for its strong blue emission but in special cases strong green, red and infrared emissions have also been observed.…”

“…Pr 3+ ion absorbs infrared 976 nm radiation weakly, which results poor fluorescence emission intensity. However, the presence of Yb 3+ traces enhances the emission intensity significantly [12][13][14][15][16][17][18]. This occurs because the Yb 3+ has very large absorption cross section for 976 nm radiation, which easily transfers the absorbed energy to Pr 3+ ions through different channels.…”

Cracks in transparent La-doped yttria ceramics and the formation mechanism

“…In a wind tunnel test, full scale domes of La-doped yttria survived the condition corresponding to Mach 5 at 50,000 feet [9]. Besides, the La-doped Yttiria can be used as the matrix for optical functional cations [10][11][12]. Yang studied the optical properties of La-doped Y 2 O 3 ceramics by solid react sintering [13], and found that the * Corresponding authors.…”