Bright thermal (blackbody) emission of visible light from LnO₂ (Ln = Pr, Tb), photoinduced by a NIR 980 nm laser

Abstract

The light-induced blackbody emission from lanthanide dioxide can improve the solar cell performance by converting NIR photons into bright visible light.

Optical Vacuum Sensor Based on Lanthanide Upconversion—Luminescence Thermometry as a Tool for Ultralow Pressure Sensing

“…In addition to the pump power applied, the magnitude of this phenomenon depends on several other factors, such as ion concentration, composition, bandgap, phonon energy, absorption coefficient, thermal conductivity of the material, particles size, and so forth . The mechanism responsible for this heating effect, i.e., heat dissipation into the surroundings (sample), is based on the nonradiative de‐excitation processes occurring in the excited Yb 3+ and Er 3+ ions, such as multiphonon relaxation, cross‐relaxation, energy migration to “traps” and defect states, which inherently accompany Yb 3+ ‐Er 3+ energy transfer processes and emission of both ions . At ambient conditions, we observe an almost linear increase of the band ratio and the corresponding temperature values (Figure 1c,d) as a function of pump power density, starting from ≈1 W mm −2 , with a rate of ≈4.2 K W −1 mm 2 .…”

Terras Raras: Tabela Periódica, Descobrimento, Exploração No Brasil E Aplicações

“…[78][79][80] Em particular, suas propriedades luminescentes, conferidas pelas intensas e estreitas bandas de emissão, resultantes de transições do tipo f-f, geram cores específicas em dispositivos luminescentes. 81,82 Assim, materiais luminescentes contendo terras raras possuem extensa aplicação em dispositivos de iluminação, como displays emissores e lâmpadas fluorescentes, 83,84 sendo extensamente processados na forma de luminóforos de estado sólido, [85][86][87][88][89][90][91][92][93][94][95][96][97][98][99] materiais híbridos e compostos de coordenação, [100][101][102][103][104][105][106][107][108] vidros, [109][110][111][112][113][114] híbridos magnéticos-luminescentes, 115,116 entre muitos outros. Além disso, a utilização de ferramentas teóricas para a descrição da luminescência de lantanídeos é extremamente útil para o aprimoramento e adaptação das propriedades observadas.…”

Broadband light emission induced by laser absorption and optimized by thermal injection in Nd3+:Y2SiO5 ceramic powder

“…By combining the different rare‐earth elements and manipulating their relative concentrations, it is possible to obtain the most appropriate mixing of RGB colors to produce white light . In recent years, a different phenomenon has been observed, in which white light was generated in materials containing a single trivalent rare‐earth element . However, there is no consensus about the origin of the process.…”

“…However, there is no consensus about the origin of the process. For example, Wang and Tanner proposed thermally induced production of free carriers, Singh and coworkers assigned the effect to thermally induced defects, Marciniak and coworkers suggested the avalanche population of charge‐transfer states, and Silva Filho and coworkers explained the phenomenon by a phonon‐assisted blackbody radiation viewpoint . Nevertheless, most of the reports present the phenomenon as being dependent of pressure and having an excitation laser power threshold.…”

“…[4][5][6][7][8] In recent years, a different phenomenon has been observed, in which white light was generated in materials containing a single trivalent rare-earth element. [9][10][11][12][13][14] However, there is no consensus about the origin of the process. For example, Wang and Tanner proposed thermally induced production of free carriers, 9 Singh and coworkers assigned the effect to thermally induced defects, 10 Marciniak and coworkers suggested the avalanche population of charge-transfer states, 11 and Silva Filho and coworkers explained the phenomenon by a phononassisted blackbody radiation viewpoint.…”