Optical heating and luminescence thermometry combined in a Cr3+-doped YAl3(BO3)4

Abstract

The possibility of optical heating with simultaneous control of the generated light within a single phosphor is particularly attractive from the perspective of multiple applications. This motivates the search for new solutions to enable efficient optical heating. In response to these requirements, based on the high absorption cross-section of Cr3+ ions, the optical heater based on YAl3(BO3)4:Cr3+ exhibiting highly efficient heating is developed. At the same time, the emission intensity ratio of 2E(g) → 4A2(g) and 4T2(g) → 4A2(g) of Cr3+ bands, thanks to the monotonic temperature dependence, enables remote temperature readout of the phosphor using luminescence thermometry technique. The combination of these two functionalities within a single phosphor makes YAl3(BO3)4:Cr3+ a promising, self thermally controlled photothermal agent.

Synergy between structural rigidity and cluster defects in a bright near-infrared Cr3+-based phosphor for excellent thermal stability and long afterglow

“…The thermal depopulation of the 4 T 2 state is realized through a cross-over process from the 4 T 2 to the 4 A 2 state (process 4). 52 At high temperatures, the electrons can easily reach the intersection point of the 2 E and 4 T 2 excited levels from the 2 E state in the case of intermediate crystal field strength, and this process (process 3) has an energy barrier denoted as Δ E 1 (where Δ E 1 < Δ E 2 for the intermediate crystal field). Following this, the electron can undergo radiative transition or non-radiative transition from 4 T 2 excited levels to the ground state.…”

Enhancing the inherent NIR photoluminescence in SrLaLiTeO6 through Cr3+–Yb3+ co-substitution for high performance pc-LEDs

“…Cr 3+ has an outer electronic configuration of 3d 3 , which is the same as that of Mn 4+ and V 2+ . 9,10 The intra-3d electronic transitions of Cr 3+ ions can be well characterized using the crystal field theory. The luminescence of Cr 3+ ions can be tuned from a narrow 2 E g → 4 A 2g R line emission to a broadband 4 T 2g → 4 A 2g emission by varying the highly sensitive crystal field where 4 A 2g is the ground state of the 3d 3 electron and 2 E g / 4 T 2 are the excited states.…”

Luminescence and temperature‐sensing properties of Y4GeO8:Bi3+,Eu3+ phosphor

“…In various branches of scientific research, temperature is one of the most commonly measured fundamental physical parameters 1,2 . Measurements of temperature at various scales are relevant to various areas of life, industrial production, and medicine 3–6 . Noncontact thermometry has recently attracted an increasing attention due to fast response time, high detection sensitivity, high measurement precision, and noncontact mode 7,8 …”

“…1,2 Measurements of temperature at various scales are relevant to various areas of life, industrial production, and medicine. [3][4][5][6] Noncontact thermometry has recently attracted an increasing attention due to fast response time, high detection sensitivity, high measurement precision, and noncontact mode. 7,8 Optical parameters that rely on temperature, such as position of the emission peak, fluorescence intensity ratio (FIR), emission intensity, thermochromic, and luminescent decay lifetime, are the foundation of optical thermometry.…”