Broadband near-infrared emission in the NaInP2O7:Cr3+ phosphor for light-emitting-diode applications

Design, luminescence properties and applications of Cr3+-doped ScTaO4: a broadband near-infrared phosphor

“…For the directly allowed transition, directly forbidden transition, indirectly allowed transition and indirectly forbidden transition, n is 1/2, 3/2, 2 and 3, respectively. 19 The electronic band structure of ScTaO 4 is a direct transition with an allowed transition, so n = 1/2. In this way, the optical band gap of ScTaO 4 is calculated to be 4.66 eV.…”

Achieving a tunable and ultra-broadband near-infrared emission in the Ga2−2xZnxGexO3:Cr3+ phosphor

“…Enhanced lattice-electron coupling results in more energy being lost through the non-radiative relaxation pathway. Moreover, the absorption efficiency of all these samples is above 43%, being higher than most reported Cr 3+ -doping NIR phosphors, ascribing to the distorted octahedral site in this compound, 30 which enables an external quantum efficiency (EQE) above 20% ( x = 0.12). Fig.…”

Blue-light-excitable pure and efficient short-wave infrared luminescenceviaCr3+→ Yb3+energy transfer in a KYbP2O7:Cr3+phosphor

“…59,63 The increase of temperature will intensify the EPC effect, leading to a reduction of energy transferred from Cr 3+ to Yb 3+ , resulting in the decrease of the Yb 3+ SWIR luminescence. Significantly, it can be found that the integrated SWIR emission intensity of the KYbP 2 O 7 :0.01Cr 3+ phosphor at 120 °C retains 55.6% of the room temperature SWIR luminescence intensity, which is better than those of most of the other AMP 2 O 7 compounds (for example, ∼30%@120 °C in LiScP 2 O 7 :Cr 3+ , 51%@100 °C in LiGaP 2 O 7 :Cr 3+ , 47.5%@100 °C in NaInP 2 O 7 :Cr 3+ , and 47%@100 °C in LiInP 2 O 7 :Cr 3+ ), 38,64–66 suggesting that the phosphor has a fairly good luminescence thermal stability. Furthermore, as can be seen from Fig.…”