Up-conversion fluorescence and thermal optical bistability in Gd2O3: 10% Yb3+, 0.5% Tm3+

Intrinsic bistability effect of Yb-sensitized Tm upconversion emission in zirconium dioxide nanocrystal

“…Note that in our observation of the upconversion bistability, one of the most importance features is the clockwise bistability cycle showing that the upconversion emission intensity at decreasing pump power is lower than that at increasing pump power. It is dramatically different from the previous observations in Yb,Er and Yb,Tm doped systems exhibiting the counterclockwise bistability loops [14,15]. This implies a different physical mechanism responsible for the intrinsic bistability effect of Yb-sensitized Tm upconversion emission in new matrix of ZrO 2 nanocrystals.…”

“…Under the excitation of 973 nm diode laser, the dependence of the Tm 3+ upconversion emission intensity on the pump power shows distinct optical bistability behavior. One of the notable features, different from the previous observations in Yb/Er and Yb/Tm systems [12][13][14][15], is the clockwise cycle bistability loop showing that the upconversion emission intensity at decreasing pump power is lower than that at increasing pump power. The possible physical mechanism of the abnormal strong bistability effect is discussed taking into account the strong pump-induced local thermal loading.…”

“…Moreover, the strong bistability hysteresis has much larger bistable domain and much higher switching contrast than the previous results of Yb,Tm codoped Gd 2 O 3 and Y 2 O 3 Nanophosphors [14,15]. These excellent properties make the intrinsic bistability of Tm,Yb:ZrO 2 nanocrystal more suitable for the relevant application in optical communications.…”

“…Recently, the first observation of bistable energy transfer between different rare-earth ions was reported in Yb, Er doped CsCdBr 3 single crystals at cryogenic cooling temperatures, which is responsible for the interesting bistable charomatic switching [12]. The new systems of Yb, Tm codoped solids were also exploited to perform intrinsic bistability of luminescence but with weak nonlinear optical hysteresis [13][14][15].…”

Size-tunable synthesis of lanthanide-doped Gd2O3nanoparticles and their applications for optical and magnetic resonance imaging

“…17,18 In addition, Gd 2 O 3 is also a promising host matrix for upconversion fluorescence because of its good chemical durability, thermal stability, and low phonon energy (phonon cutoff z 600 cm À1 ). 19,[32][33][34][35][36][37] For example, Guo et al has demonstrated the production of Ln 3+ (Ln ¼ Yb, Er and Tm) doped Gd 2 O 3 upconversion nanoparticles. Their results clearly showed that by doping Ln 3+ ions into the Gd 2 O 3 , these nanoparticles could emit strong multicolor upconversion emissions.…”