Multicolor Phosphate Glasses for Potential White LED Lighting and X‐Ray Detections

Abstract

Though widely applied in light-emitting diode (LED) lighting and X-ray detection, respectively, rare-earth ions doped phosphor and scintillating single crystals still face many challenges in practicalities, like aging of package material and difficulty to construct tiny array structure. Using phosphate glass as the host is quite beneficial for solving these problems while enabling distinguished luminescence. Therefore, Eu 3+ and Tb 3+ doped phosphate glasses which, respectively, show strong red/green emissions are researched. Superior thermal stabilities (78.69% and 89.35% emission intensities remain at 150 °C) and high internal quantum efficiencies (87.3% and 68.6%) are found to guarantee the excellent photoluminescence performances. The brilliant X-ray excited luminescence properties are demonstrated by general 19.49% and 34.74% integrated emission intensities of that of commercial Bi 4 Ge 3 O 12 single crystal scintillator with the change of X-ray power. Meanwhile, Tb 3+ doped scintillating fiber is drawn. Finally, excited by 380 nm LED, color manipulation and white light generation are achieved in LEDs with a structure of stacked emitting layers (mainly Eu 3+ and Tb 3+ doped phosphate glasses). Many of the as-constructed white LED's performance parameters are much better than the commercial white LED. These results show that Eu 3+ and Tb 3+ doped phosphate glasses possess promising potential in LED lighting and X-ray detections.

Organic Cation Design of Manganese Halide Hybrids Glass toward Low‐Temperature Integrated Efficient, Scaling, and Reproducible X‐Ray Detector

“…[1][2][3] However, traditional X-ray single-crystal scintillators, which have been successfully developed and commercialized, usually require high-temperature preparation and long production cycle, such as Lu 3 Al 5 O 12 :Ce (LuAG:Ce 1450°C), Bi 4 Ge 3 O 12 (BGO 1250°C), and CsI:Tl (620°C). [4][5][6] They cannot realize the in-situ nondestructive coupling with the external readout circuit (e.g., thin-film-transistor (TFT) arrays). The commonly adopted coupling methods are paste fixation (Epoxy resin or photosensitive adhesive) and direct deposition (physical vapor deposition).…”

Realizing efficient photoluminescence spectral modulation via Sb3+/Ln3+ co-doping in Cs2NaInCl6 double perovskites

“…These emission peaks belong to the 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , and 5 D 4 → 7 F 3 transitions of Tb 3+ ions, respectively. 40 With increasing Tb 3+ ion concentrations, the PL intensity attributed to Tb 3+ ion emission gradually increased while the emission peak at 440 nm weakened. When Ho 3+ ions were doped into Cs 2 NaIn 0.95 Sb 0.05 Cl 6 , sharp narrow band emission peaks centered at 490 nm, 542 nm, and 657 nm were observed, which belong to the 5 F 3 , 5 F 4 , and 5 F 5 → 5 I 8 transitions of Ho 3+ ions.…”

Efficient Energy Transfer for Near-Perfect Quantum Efficiency and Thermal Stability

“…Ce 3+ ions, in particular, are renowned for their broad emission spectrum owing to the splitting of their 4f ground state into two spin orbitals, 2 F 5/2 and 2 F 7/2 , with an energy separation of approximately 2200 cm –1 , resulting in two radiative transitions from the 5d to the 4f ground state. − Moreover, these ions can serve as sensitizers, transferring absorbed energy from the n-UV excitation source to other ions such as Eu 3+ , Sm 3+ , and Tb 3+ . − Tb 3+ ions are renowned for their green emission resulting from electron transitions between the 5 D 4 and 7 F 5 energy levels. Additionally, Tb 3+ ions exhibit excellent thermal stability in their green emission, as confirmed by numerous studies. − However, the high energy required for the parity transition of Tb 3+ ions results in a strong excitation band in the far-UV region (<300 nm), while the absorption efficiency of the f-f parity forbidden transition in the n-UV region is low. These drawbacks render Tb 3+ ions challenging to activate with commercially available n-UV chips, significantly limiting their applications.…”