Enhancing up-conversion luminescence of Er³⁺/Yb³⁺-codoped glass by two-color laser field excitation

Abstract

Improving up-conversion luminescence efficiency of rare-earth ions is always a research hotspot because of its important applications in laser source, color display, photoelectric conversion and multiplexed biolabeling.

Fast–Slow Red Upconversion Fluorescence Modulation from Ho3+‐Doped Glass Ceramics upon Two‐Wavelength Excitation

“…Instead, when continuously excited Ho 3+ ‐doped GCs with 1.05 MW cm −2 of 980 nm laser, and periodically added 141.3 kW cm −2 of 1870 nm laser (Figure d). The “on‐off” fluorescence cycling is reproducible and follows the modulation of the 1870 nm laser, showing a slow fluorescence decay time of 6.65 ms (Figure e) . The experimental data show good coincidence with the theoretical simulation results.…”

“…For the fast‐slow optical modulation of red UC fluorescence, we continuously excited Ho 3+ ‐doped GCs with 141.3 kW cm −2 of 1870 nm laser, and periodically added 1.05 MW cm −2 of 980 nm laser (Figure c). The “on‐off” fluorescence cycling is reproducible and follows the modulation of the 980 nm laser, showing a fast fluorescence decay time of 66 µs (Figure e) . Instead, when continuously excited Ho 3+ ‐doped GCs with 1.05 MW cm −2 of 980 nm laser, and periodically added 141.3 kW cm −2 of 1870 nm laser (Figure d).…”

“…e) Time‐dependent fluorescence of Ho 3+ ‐doped GCs following repeated pulse sequence of 980 and 1870 nm laser: 980 and 1870 nm pulses (upper panel). The fluorescence decay time is fitted with the double exponential function: , where I and I 0 are the fluorescence intensity at time t and 0, A 1 and A 2 are constants, t is the time, and τ 1 and τ 2 present the rapid and slow fluorescence decay time for the exponent, respectively …”

Controllable optical modulation of blue/green up-conversion fluorescence from Tm3+ (Er3+) single-doped glass ceramics upon two-step excitation of two-wavelengths

“…For Er 3+ , I TSTW denotes I 8+1 in ( c ) and I 1+8 in ( d ) two-step excitation of 850 and 1530 nm, I SW1 illustrates I 1 in ( c ) and ( d ) upon single 1530 nm excitation, and I SW2 illustrates I 8 in ( c ) and ( d ) upon single 850 nm excitation, respectively. ), which is nonlinear when the NIR laser power increases43. The arrows represent the maximum tailorable UC fluorescence efficiency.…”

Photon Upconversion Kinetic Nanosystems and Their Optical Response

“…Yao et al. proposed a two‐color laser field combining the 850 nm and 980 nm lasers to improve the green and red upconversion luminescence efficiency in Er 3 + ‐doped NaYF 4 nanocrystals, and also achieved upconversion enhancement in Yb 3 + /Er 3 + ‐codoped glass by combining the 800 nm and 980 nm laser fields …”