Upconversion dynamics in Pr-doped YAlO3 and Y3Al5O12 laser crystals

Interionic Energy Transfer in Y3Al5O12: Ce3+, Pr3+, Cr3+Phosphor

“…The PLE spectrum of the yellow band consists of a group of PLE bands, including a blue PLE band at 470 nm corresponding to the transition from the ground state to the lowest-lying 5d state, and two ultraviolet (UV) PLE bands corresponding to the upper 5d states, located at 340 nm and 230 nm, respectively, 1, 2 as shown in Figure 1a. 18,19 The PLE spectra of the three groups of emissions in Pr 3+ singly doped sample are identical in the UV spectral range, showing two 4f5d PLE bands located at 288 nm and 238 nm, respectively. The group in the UV region consists of two strong bands located at 317 nm and 381 nm, which are originated to the transitions from the lowest lying 4f5d state to 3 H J (J = 4, 5, 6) and the 3 F J (J = 2, 3, 4) manifolds, respectively.…”

Enriching red emission of Y_3Al_5O_12: Ce^3+ by codoping Pr^3+ and Cr^3+ for improving color rendering of white LEDs

“…The group in the range of 450 -600 nm originates from 3 P 0  3 H 4,5 transitions dominated by a intense blue emission line at 488 nm due to 3 P 0  3 H 4 transition. The other group in red originates from 1 D 2  3 H 4 transitions dominated by a intense emission line at 608 nm with a weak satellite line at 640nm [10,11]. The PLE spectra of the three groups of emissions in Pr 3+ singly doped sample are identical in the UV spectral range, showing two 4f5d PLE bands located at 288 nm and 238 nm, respectively.…”

Intense NIR emissions at 0.8 μm, 1.47 μm, and 1.53 μm from colloidal LiYbF4:Ln3+ (Ln = Tm3+ and Er3+) nanocrystals

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The upconversion (UC) process is largely exhibited by lanthanide (Ln 3+ ) ions and generally occurs via three different mechanisms: energy transfer upconversion (ETU), excited state absorption (ESA) and photon avalanche (PA). [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The upconversion (UC) process is largely exhibited by lanthanide (Ln 3+ ) ions and generally occurs via three different mechanisms: energy transfer upconversion (ETU), excited state absorption (ESA) and photon avalanche (PA).…”

“…Upconverting nanomaterials which are able to convert lower energy radiation (near-infrared) to higher energy radiation (ultraviolet (UV) or visible) by absorbing one or more low energy photons have gained much attention recently owing to their potential use in a wide range of applications from optoelectronic devices to bioimaging. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The upconversion (UC) process is largely exhibited by lanthanide (Ln 3+ ) ions and generally occurs via three different mechanisms: energy transfer upconversion (ETU), excited state absorption (ESA) and photon avalanche (PA). [16][17][18] Among these mechanisms, ETU is predominantly observed in colloidal nanocrystals, particularly in Yb 3+ ion co-doped materials.…”