Spectroscopic and upconversion properties of Er3+/Yb3+-codoped KLTN single crystal

Control of green and red upconversion in NaYF4:Yb3+,Er3+ nanoparticles by excitation modulation

“…This treatment builds upon lanthanide luminescence analysis presented elsewhere. 17,18 First, we assume that back energy transfer and excited state absorption (ESA) effects are negligible. Weak transitions and those that occur rapidly, such as 4 F 7/2 / 4 S 3/2 , are neglected, and transitions that would populate 4 F 7/2 are instead listed as population routes for 4 S 3/2 .…”

In situ visualizing the evolution of the light-induced refractive index change of Mn:KLTN crystal with digital holographic interferometry

“…Due to its excellent nonlinear electro-optic performance, potassium lithium tantalate niobate (KLTN) crystal has been intensively investigated for about decades and widely applied in such fields as electroholographic holography, [1][2][3] holographic data storage, 4 optical phase conjugation 5 and other situations, [6][7][8][9] the physical basis of whose many applications is the voltage-controlled photorefractive (PR) effect. As it is known, the PR effect, i.e.…”

“…The first observer of the phenomena was Ashkin et al, 10 and many relevant problems have then been addressed, including PR effect mechanism, [11][12][13] PR phenomenon, [14][15][16] measurement of the induced refractive index change, [17][18][19][20] PR crystal grown, 21 and its applications in crystal and thin film. [6][7][8][9]22 The visualization of the induced refractive index change of photorefractive crystal is of much significance and necessity for the understanding and control of photorefractive process. Digital holography has been presented for in situ observation of the light-induced refractive index change, by which the phase map of the optical path difference can be obtained due to the refractive index changes.…”

Synthesis and upconversion luminescent properties of Er3+ doped and Er3+–Yb3+ codoped GdOCl powders

“…Optical properties of trivalent lanthanide ions such as Er 3+ in powders [1][2][3][4][5], crystals [17,18], ceramics [19][20][21] and glasses [16,22] in different host matrices have been extensively researched. Owing to low phonon energy and high upconversion efficiency [23,24], fluorides are the most widely investigated host materials for upconversion luminescence.…”