Light-into-heat conversion in La_2O_3:Er^3+-Yb^3+ phosphor: an incandescent emission

Abstract

Low-power-threshold cw laser-induced incandescence (CWLII) has been observed in La(2)O(3):Er(3+)-Yb(3+) phosphor on excitation by a 976 nm IR laser. It is suggested that incandescence originates from the extensive heating induced by the nonradiative processes taking place following the laser excitation. Other mechanisms for similar observations have also been suggested in the literature and have been discussed with the present observations. The estimated temperature for the CWLII approaches around 2650 K, and this seems to provide an effective way to rapidly attain high temperature in nano/microvolumes of phosphor. The phosphor exhibited efficient upconversion, and the ratio of the (2)H(11/2)→(4)I(15/2) and (4)S(3/2)→(4)I(15/2) band intensities of Er(3+) permits measurement of the temperature rise, from a distance.

All‐In‐One Optical Heater‐Thermometer Nanoplatform Operative From 300 to 2000 K Based on Er3+ Emission and Blackbody Radiation

“…[ 10 ] A similar broadband visible emission has been reported for lanthanide oxides, [28][29][30] [ 33 ] carbon nanotubes, [ 34 ] and Si and SiC nonoparticles, [ 35 ] upon CW laser excitations but its origin is still contentious: it has been ascribed to incandescent/blackbody emission, [ 29 , 30 , 34 , 35 ] photon up-conversion emission induced by a thermal avalanche process, [ 28 ] defect emissions [ 33 ] and anti-Stokes emissions. [ 32 ] In ref.…”

“…The local temperature is calculated using: (i) Boltzmann's distribution (300-1050 K with resolution of 0.3-2.0 K and under several pump power cycles) for the Er 3 + up-conversion NRs and, thus, the operating range of the nanothermometers is easily adjusted by controlling the amount of AuNPs. Analogous white-light emission upon CW laser excitation has been reported for disparate materials, such as lanthanide oxides, [28][29][30][31] LiYbP 4 O 12 , [ 32 ] YVO 4 :Yb 3 + /Er 3 + nanoparticles, [ 33 ] carbon nanotubes, [ 34 ] and Si and SiC nanoparticles, [ 35 ] but its origin is still contentious. A remarkable result of the present study is the unambiguous attribution of this white-light emission to an incandescence process, hence settling the controversy.…”

Near-Infrared Emission and Photon Energy Upconversion of Two-Dimensional Copper Silicates

“…Upconversion from infrared to visible region has attracted considerable interest due to its numerous applications after its discovery in the mid1960s 10 . Recently, photon energy upconversion (PEUC) by thermal radiation based on lanthanide ions appears as a new UC pathway and has received growing attention [11][12][13][14] . Unlike normal upconversion mechanisms, photon energy upconversion by thermal radiation can reach much higher upconversion efficiency.…”

Enhanced temperature sensing response of upconversion luminescence in ZnO–CaTiO3: Er3+/Yb3+ nano-composite phosphor

“…The Er 3+ ion has enough number of long lived energy levels and thus showing strong upconversion emissions in UV-Visible region on infrared excitation. This ion is treated as one of the most efficient upconversion activators [11]. The Yb 3+ ion on the other hand is known as good sensitizer that obviously increases the optical pump efficiency, being the high absorption cross section around 980 nm excitation wavelength.…”