Intrinsic optical bistability and frequency upconversion in Tm³⁺–Yb³⁺-codoped Y₂WO₆ phosphor

Abstract

The phase and crystal structure of Tm(3+)-Yb(3+) codoped Y2WO6 phosphor synthesized via the solid state reaction method was analysed by X-ray diffraction. The surface morphology and impurity content of the phosphor were analysed by field emission scanning electron microscopy (FE-SEM) and Fourier transform infrared (FTIR) spectroscopy, respectively. Upon excitation from a 980 nm diode laser, the developed phosphor shows three upconversion emission bands. Codoping with Yb(3+) ions in the Y2WO6:Tm(3+) phosphor significantly enhances the intensity of the frequency upconversion emission. The processes responsible for the UC emissions and their intensity variation upon codoping have been discussed with the help of pump power dependence, energy level diagrams and decay curve analysis. The intrinsic optical bistability and colour tunability are also reported for the developed phosphor.

Thermal and pump power effect in SrMoO4:Er3+-Yb3+ phosphor for thermometry and optical heating

“…The research in the field of REs doped phosphors has been growing due to their various technological applications such as in light emitting diodes (LEDs), display devices, optical temperature sensing, nanoheating and solar cell efficiency enhancement [1][2][3][4][5]. In recent years, frequency upconversion (UC) phenomenon has become an effective way of producing visible light by using near infrared (NIR) diode laser excitation [6][7][8].…”

SrMoO4:Er3+-Yb3+ upconverting phosphor for photonic and forensic applications

“…7). It is M A N U S C R I P T well known that the decay time is inversely proportional to the radiative transition probability [3]. Therefore, the observed decrement in the decay time in case of the codoped phosphor is a clear explanation for energy transfer process form Yb 3+ →Er 3+ .…”

“…Nevertheless, the researchers are still engaged in search of important mechanism which makes the RE doped materials completely non-tunable. The non-tunable phosphors are effectively applicable in display devices, photonics, security and finger print applications [3,5,23]. Also, the non-tunable materials with invariant colour co-ordinate can be operated upto higher pump power.…”

“…The rare earths (REs) doped phosphors are of great importance in recent years due to its non-linear optical behaviour, striking luminescence, magnetic, biological, nanothermometry and nanoheating applications [1][2][3][4][5][6][7][8]. The frequency upconversion (UC) process generates antistokes emission with the help of intermediate levels through multiphoton absorption which makes it different from the other photoluminescence processes [9].…”

Effect of rare earth Ce on the far infrared radiation property of iron ore tailings ceramics

“…2 Further analysis shows that iron diopside's crystallite size changed to a certain extent when calculated by Debye Scherrer's formula [30,31]:…”