Achievement of full-visible-spectrum lighting in Bi3+-activated strontium gallates via lattice site occupancy engineering toward WLEDs applications

Zhu, Xuanyu; Yu, Xue; Liu, Haozhe; Nie, Lin; Zhao, Feng; Yu, Siu Fung; Qiu, Jianbei; Xu, Xuhui; Wang, Ting

doi:10.1016/j.mtphys.2023.100968

Cited by 13 publications

(9 citation statements)

References 34 publications

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“…There are two Ca sites that coordinate with six O atoms and seven O atoms to form [Ca1O 6 ] and [Ca2O 7 ], respectively, and Sc concatenates six O atoms and constitutes a [ScO 6 ] octahedral structure. 14 Because of the difference of the coordination environment, Bi 3+ would not occupy the [Ca2O 7 ] site and may replace the [Ca1O 6 ] or the [ScO 6 ] site. Combining the coordination numbers and ionic radii of Bi 3+ (CN = 6, r = 1.03 Å), a Sc atom (CN = 6, r = 0.75 Å), one Ca atom (CN = 6, r = 1.00 Å), and one B atom (CN = 4, r = 0.11 Å), Bi 3+ preferentially replaces Ca 2+ and Sc 3+ .…”

Section: Resultsmentioning

confidence: 99%

A novel blue emitting phosphor Ca_1−ySr_yScBO₄:Bi³⁺ with zero-thermal quenching for multi-scenario application

Yan,

Li,

Gong

et al. 2024

Dalton Trans.

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Section: Resultsmentioning

confidence: 99%

A novel blue emitting phosphor Ca_1−ySr_yScBO₄:Bi³⁺ with zero-thermal quenching for multi-scenario application

Yan,

Li,

Gong

et al. 2024

Dalton Trans.

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“…The crystal field strength ( D q ) can be calculated using the following equation: where D q represents the energy level separation degree, Z is the anion charge, e is the electronic charge, r is the d-wave function radius, and R is the bond length. Evidently, R 5 is inversely proportional to D q ; thus, longer wavelength emissions could be generated theoretically through regulating the occupation of Bi 3+ at sites with smaller coordination numbers and shorter bond lengths . In the LiGa 5 O 8 host, the average bond length of Li1–O/Ga1–O (2.051 Å) is greater than that of Ga2–O (1.776 Å).…”

Section: Resultsmentioning

confidence: 99%

“…Evidently, R 5 is inversely proportional to D q ; thus, longer wavelength emissions could be generated theoretically through regulating the occupation of Bi 3+ at sites with smaller coordination numbers and shorter bond lengths. 42 In the LiGa ] tetrahedral sites with a high crystal field strength, 23,34,41 respectively (Figure 2c). As plotted in Figure 2c, with the doping concentration of Bi 3+ changing from 0.5 to 5%, the PL intensities monitored at 511 nm increase, while that of 718 nm reaches the maximum at 1% and then decreases, ascribed to the selective site occupation of Bi 3+ ions and their distinct concentration quenching effects on different occupy sites.…”

Section: Materials and Preparationmentioning

confidence: 99%

Prolonged Red Persistent Luminescence in Bi³⁺ Single-Doped LiGa₅O₈: Regulating Traps by Site Selective Occupation

Yi,

Liu,

Liu

et al. 2023

Inorg. Chem.

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Persistent luminescence (PersL) materials with impressive superiorities in optical performance have shown tremendous potential for information encryption application. Herein, a Bi 3+ -doped LiGa 5 O 8 PersL material is facilely synthesized by a simple solid-state reaction. Site selective and preferential occupation of Bi 3+ ions at distinct Ga 3+ and Li + polyhedra sites in LiGa 5 O 8 endows it with a bimodal emission at 511 and 718 nm upon UV excitation at 254 nm. After removing the light source, an intense red afterglow was observed due to the generation of more and deeper traps classified as the oxygen vacancy defect (V O•• ) and the impurity defect (Bi Li ••). It is rarely reported in inorganic phosphors to achieve the Bi 3+ single doping-activated red PersL. The LiGa 5 O 8 :x% Bi 3+ (with x = 0.5−5.0) samples also exhibit tunable PL and timedependent PersL properties. Combined with the Morse Code, a multiple information encryption model based on the abnormal optical properties of LiGa 5 O 8 :x% Bi 3+ (x = 0, 0.5, and 5.0) samples was designed for high-level dynamic anticounterfeiting. These achievements further validate the use of the Bi 3+ single doping strategy to explore excellent PersL materials and expand their multifunctional optical applications.

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“…Ultraviolet (UV) excited luminescence characteristics of Eu ions, Ce ions, and other ions in different host lattice (aluminate, silicate, phosphate, and borate) matrices have been explored for the cyan‐emissive photophores. [ 25–30 ] For example, Liang et al. reported cyan‐emitting Ce 3+ ‐doped Ca 2 YHf 2 Al 3 O 12 (CYHAO) garnet phosphor with bright broadband cyan emission (λ em = 493 nm; bandwidth = 100 nm) together with a photoluminescence quantum yield (PL QY) of 89.5% under 408 nm excitation.…”

Section: Introductionmentioning

confidence: 99%

Polymer‐Encapsulated Halide Perovskite Color Converters to Overcome Blue Overshoot and Cyan Gap of White Light‐Emitting Diodes

Peng

Sun

et al. 2023

Adv Funct Materials

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Currently, the most popular way to manufacture white light‐emitting diodes (WLEDs) is based on blue‐emitting InGaN LED chips (440–460 nm) and yellow‐emitting phosphor coating (520–700 nm) to produce white light lighting. However, because conventional white WLEDs lack the uniformly distributed continuous emission spectrum compared to natural sunlight: “blue overshoot” (extra 440–460 nm blue‐light can cause damage to the retina) and “cyan gap” (470–520 nm wavelength range). Here, a novel strategy to “kill two birds with one stone” is reported: using the stable and bright polymer encapsulated perovskite nanocrystals (PNCs) composite films as the cyan color converters that efficiently absorb the “blue overshoot” and effectively emit the cyan light to fill the “cyan gap”. A series of polymer‐encapsulated PNC films is achieved that can reach very high photoluminescence quantum yield (PL QY) of 90–95% under 450 nm blue‐light excitation. Importantly, both 370 nm UV‐excited WLED and 455 nm blue‐excited WLED devices are constructed that exhibit smoothly and evenly distributed white light without blue overshoot and cyan gap, which was not achieved before for blue‐excited cyan‐emissive materials. This study paves the way toward the application of PNC color converters in the next generation full‐visible‐spectrum WLED lighting that mimic the natural daylight.

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Achievement of full-visible-spectrum lighting in Bi3+-activated strontium gallates via lattice site occupancy engineering toward WLEDs applications

Cited by 13 publications

References 34 publications

A novel blue emitting phosphor Ca_1−ySr_yScBO₄:Bi³⁺ with zero-thermal quenching for multi-scenario application

A novel blue emitting phosphor Ca_1−ySr_yScBO₄:Bi³⁺ with zero-thermal quenching for multi-scenario application

Prolonged Red Persistent Luminescence in Bi³⁺ Single-Doped LiGa₅O₈: Regulating Traps by Site Selective Occupation

Polymer‐Encapsulated Halide Perovskite Color Converters to Overcome Blue Overshoot and Cyan Gap of White Light‐Emitting Diodes

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Achievement of full-visible-spectrum lighting in Bi3+-activated strontium gallates via lattice site occupancy engineering toward WLEDs applications

Cited by 13 publications

References 34 publications

A novel blue emitting phosphor Ca1−ySryScBO4:Bi3+ with zero-thermal quenching for multi-scenario application

A novel blue emitting phosphor Ca1−ySryScBO4:Bi3+ with zero-thermal quenching for multi-scenario application

Prolonged Red Persistent Luminescence in Bi3+ Single-Doped LiGa5O8: Regulating Traps by Site Selective Occupation

Polymer‐Encapsulated Halide Perovskite Color Converters to Overcome Blue Overshoot and Cyan Gap of White Light‐Emitting Diodes

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A novel blue emitting phosphor Ca_1−ySr_yScBO₄:Bi³⁺ with zero-thermal quenching for multi-scenario application

A novel blue emitting phosphor Ca_1−ySr_yScBO₄:Bi³⁺ with zero-thermal quenching for multi-scenario application

Prolonged Red Persistent Luminescence in Bi³⁺ Single-Doped LiGa₅O₈: Regulating Traps by Site Selective Occupation