Deep red upconversion photoluminescence in Er³⁺‐doped Yb₃Ga₅O₁₂ nanocrystalline garnet

Abstract

The nanocrystalline single-phase Er 3+ -doped Yb 3 Ga 5 O 12 garnets have been prepared by the sol-gel combustion technique with a crystallite size of ≈30 nm. The presence of Yb 3+ in garnet hosts allows their efficient excitation at the ≈977 nm wavelength. The Er 3+ doping of Yb 3 Ga 5 O 12 garnet host results in deep red Er 3+ : 4 F 9/2 → 4 I 15/2 upconversion photoluminescence (UCPL) emission. The dominance of the red UCPL emission over the green Er 3+ : 4 F 7/2 / 2 H 11/2 / 4 S 3/2 → 4 I 15/2 component was investigated using the measurement of the steady-state and timedependent Er 3+ and Yb 3+ emission spectra in combination with the powerdependent UCPL emission intensity. The proposed upconversion mechanism is discussed in terms of the Er 3+ → Yb 3+ energy back transfer process as well as Yb 3+ (Er 3+ ) → Er 3+ energy transfer and Er 3+ ↔ Er 3+ cross-relaxation processes. The studied Er 3+ -doped Yb 3 Ga 5 O 12 garnet may be utilized as a red upconversion emitting phosphor.

Near-infrared emission in Ho3+-doped Yb3Ga5O12 garnet nanocrystals

“…The dried gel was decomposed in a furnace at 800 °C for 2 h and subsequently at 1000 °C for ½ h to form white powder. Details of the synthetic procedure can be found in the previous work [26].…”

Deciphering crystal structure of Li3Bi3Te2O12:Sm3+ phosphors with high thermal stability for plant cultivation and white light‐emitting diodes

“…[24][25][26] Garnet lattices have excellent chemical stabilization and are widely applied in magnetic materials, mechanical applications, and WLEDs. [27][28][29][30] Researchers have constructed some garnet-type compounds as different kinds of phosphors, like green-emitting Ca 3 Sc 2 Si 3 O 12 :Ce 3+ , the white-emitting Li 3 Gd 3 Te 2 O 12 :Bi 3+ , Pr 3+ , and the blue-yellow emitting Li 3 Y 3 Te 2 O 12 :Dy 3+ phosphors. [31][32][33] Tellurates possess a favorable environment for accommodating phosphor matrices due to their low phonon energy (800−900 cm −1 ), which effectively mitigates the occurrence of nonradiative decay that could potentially compete with doped rare-earth ions.…”

“…To utilize LED light for plant growth applications, plenty Sm 3+ ‐doped phosphors were synthesized such as NaSrY(MoO 4 ) 3 :Sm 3+ , Sr 8 ZnY(PO 4 ) 7 :Sm 3+ , and Ca 2 LaNbO 6 :Sm 3+ base on the well‐matched spectral lines of phytochromes 24–26 . Garnet lattices have excellent chemical stabilization and are widely applied in magnetic materials, mechanical applications, and WLEDs 27–30 . Researchers have constructed some garnet‐type compounds as different kinds of phosphors, like green‐emitting Ca 3 Sc 2 Si 3 O 12 :Ce 3+ , the white‐emitting Li 3 Gd 3 Te 2 O 12 :Bi 3+ , Pr 3+ , and the blue‐yellow emitting Li 3 Y 3 Te 2 O 12 :Dy 3+ phosphors 31–33 .…”

Upconversion luminescence and temperature sensing properties of Yb2(MoO4)3:Ln3+ (Ln = Ho, Tm, Er) phosphors based on energy transfer

“…Therefore, the energy level transitions of rare earth ions are in the focus of UC luminescence. [8][9][10] As a new generation of solid-state lighting sources, white LEDs have been favored by everyone because of their advantages such as low energy consumption, environmental friendliness and pollution-free operation. However, traditional tricolor phosphors have a certain impact on the stability of white LEDs.…”

“…Therefore, the energy level transitions of rare earth ions are in the focus of UC luminescence. 8–10…”