Temperature triggering a photon-avalanche-like mechanism in NdAl3(BO3)4 particles under excitation at 1064 nm

Laser-Induced Broadband White Emission of NdAlO3 Nanocrystals in Alcohols

“…Although some reports suggest a purely thermal origin for LIWE, 28,44,45 luminescent thermometry, 8,42 deviation from the Stefan−Boltzmann law, 13 and the fact that this emission was observed in liquid N 2 46 indicate otherwise. Recently, a photon avalanche-like mechanism was proposed for nonresonant excitation of Nd-containing materials at 1064 nm; 35,36 however, since in the present case a resonant excitation was used, photon avalanche is unlikely. Instead, these results might indicate that electron ejection is the main initiator for LIWE since the threshold is higher when electron ejection is more difficult.…”

“…For NdAlO 3 in vacuum, the shape of the emission can be described of a very broad band comprising the whole visible range with the presence of several well-defined bands. Two different explanations are given in the literature: Nd 3+ reabsorption ,,− and the Nd 3+ avalanche-like mechanism. − Although in methanol small drops in intensity can be seen, when immersed in the other alcohols the well-defined structure disappeared, resulting in only a broadband typical of other materials, ,,, and had a very high resemblance to the LaAlO 3 in vacuum. For this reason, it seems likely that Nd 3+ reabsorptions or avalanche-like emissions are broadened due to interactions with the solvent appearing as a single broadband.…”

Broad Luminescence Generated by IR Laser Excitation from CsPbBr3:Yb3+ Perovskite Ceramics

“…Since its first description, a wide variety of materials were described as capable of producing LIE, such as transition metal- or lanthanide-doped garnets [ 16 , 17 ], transparent ceramics [ 18 , 19 ], a wide variety of inorganic nanocrystals, such as Sr 2 CeO 4 [ 14 , 20 , 21 ], or LnAlO 3 (where Ln can be different lanthanides) [ 11 , 22 ], Sn-based clusters [ 23 , 24 ], YVO 4 [ 25 ], silica porous materials [ 26 ], and even carbon-based materials, such as graphene [ 27 ] or diamonds [ 28 ]. Despite the fact that many materials have been discovered for LIE, the mechanism is still not agreed upon, and several have been proposed, such as blackbody emission [ 29 , 30 ], oxygen vacancies [ 25 ], photon avalanche [ 31 , 32 ], and radiative energy loss ( bremsstrahlung emission) [ 24 ], to cite a few. However, multiphoton ionization and subsequent intervalence charge transfer (IVCT) have been receiving significant attention.…”

Bright Warm White Emission of Nd0.9Yb0.1AlO3 Nanocrystals under High Power Density Infrared Excitation

“…In this context, LIWE materials might be applicable for warm white lighting. Although different mechanisms were proposed, such as blackbody radiation, 27,28 thermionic emission 12 and photonavalanche like emission, 29,30 intervalence charge transfer (IVCT) has been largely reported. Such mechanism describes a multiphoton absorption and ionization leading to the formation of ionic pairs M (n)+ -M (n+1)+ capable of IVCT emission.…”