Energy transfer and highly thermal stability in single-phase SrY2O4:Bi3+,Sm3+ phosphors for UV-LEDs

Charge transfer band excitation of La3NbO7:Sm3+ phosphors induced abnormal thermal quenching toward high‐sensitivity thermometers

“…8 Recently, there is a lot of literature to discuss the photoluminescence (PL) properties of Sm 3+ -activated phosphors. For instance, Wei et al described that the SrY 2 O 4 :Bi 3+ /Sm 3+ phosphors with high thermal stability could be promised for ultraviolet (UV) lighting-emitting diodes (LEDs) 9 ; Zhang et al suggested that the NaGd(MoO 4 ) 2 : Sm 3+ /Tb 3+ phosphors could be used in optical temperature sensors 10 ; Si et al determined that the LaNbO 4 :Sm 3+ /Er 3+ phosphors could be applied in the plasma display panels 11 ; Shu et al confirmed that the novel NaCaTiTaO 6 :Sm 3+ phosphors could be potential for chromatic coordinate was found to be (0.609, 0.387), which also showed the excellent thermal performance, exhibiting its emission intensity of about 90.67% at 423 K with respect to 303 K. In the case of CTB excitation, the La 3 NbO 7 :0.1Sm 3+ phosphor emitted an orange-yellow region with the chromaticity coordinate of (0.540, 0.443), and the emission intensity was stronger than the above one (λ ex =405 nm) even though the optimized sample would be changed to the La 3 NbO 7 :0.05Sm 3+ phosphor. With the increase of temperature, the obtained sample revealed an abnormal thermal quenching phenomenon between the emission peak of the host material and the emission transition of 4 G 5/2 → 6 H 9/2 under the excitation wavelength of 250 nm, which could be suggested to turn into a pair of thermal-couple levels.…”

“…Recently, there is a lot of literature to discuss the photoluminescence (PL) properties of Sm 3+ ‐activated phosphors. For instance, Wei et al described that the SrY 2 O 4 :Bi 3+ /Sm 3+ phosphors with high thermal stability could be promised for ultraviolet (UV) lighting‐emitting diodes (LEDs) 9 ; Zhang et al suggested that the NaGd(MoO 4 ) 2 : Sm 3+ /Tb 3+ phosphors could be used in optical temperature sensors 10 ; Si et al determined that the LaNbO 4 :Sm 3+ /Er 3+ phosphors could be applied in the plasma display panels 11 ; Shu et al confirmed that the novel NaCaTiTaO 6 :Sm 3+ phosphors could be potential for white LEDs, and so forth 12 . Therefore, it is reasonable to consider that the Sm 3+ activator has attracted extensive interest from researchers 13,14 .…”

The photoluminescence of isolated and paired Bi3+ ions in layered LnOCl crystals: a first-principles study

“…4,5 Bi 3+ has been doped in many metal oxides and halides, such as garnets, 6 silicates 7 and halide perovskites, 8 and the emissions range from ultraviolet to green and even red, making them attractive for lighting and scintillation applications. [9][10][11] Single Bi 3+ (6s 2 ) spectroscopy in various host compounds has been studied to show the interconfigurational 6s 2 2 6s 1 6p 1 transition or various charge transfer transitions. 12,13 Recently, the Bi 3+ concentration-dependent pair emissions of visible wavelength have been reported experimentally in many systems of crystals.…”

Tunable Luminescence Properties and Elucidating the Electronic Structures of Single-Phase Spherical BaWO4: Dy3+, Tm3+, Eu3+ Phosphors for Warm-White-Lighting

“…The most common one is InGaN blue chips combined with YAG: Ce 3+ yellow phosphors, which shows high correlated color temperature (CCT > 4500 K) because of the deficiency of red component [5][6][7][8]. Another method is combined red, green and blue (RGB) phosphors with ultraviolet (UV) or near-ultraviolet (NUV) chips, which still has a problem that phosphors may have different degradation rates and the final color of light will change over time [9][10][11][12]. A more attractive approach is using a UV chip in conjunction with a single-phase phosphor that has multiple emitting centers to get warm-white light [13][14][15].…”