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1.内蒙古师范大学 物理与电子信息学院, 内蒙古 呼和浩特 010022
2.内蒙古师范大学 内蒙古自治区功能材料物理与化学重点实验室, 内蒙古 呼和浩特 010022
3.内蒙古自治区新能源储能材料工程研究中心, 内蒙古 呼和浩特 010022
Received:30 May 2022,
Revised:09 June 2022,
Published:05 August 2022
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王新然,王凤翔,廖雨等.自激活LiSr2Ca2(BN2)3荧光粉的合成与发光性能[J].发光学报,2022,43(08):1227-1235.
WANG Xin-ran,WANG Feng-xiang,LIAO Yu,et al.Synthesis and Luminescent Properties of Self-activated LiSr2Ca2(BN2)3 Phosphor[J].Chinese Journal of Luminescence,2022,43(08):1227-1235.
王新然,王凤翔,廖雨等.自激活LiSr2Ca2(BN2)3荧光粉的合成与发光性能[J].发光学报,2022,43(08):1227-1235. DOI: 10.37188/CJL.20220217.
WANG Xin-ran,WANG Feng-xiang,LIAO Yu,et al.Synthesis and Luminescent Properties of Self-activated LiSr2Ca2(BN2)3 Phosphor[J].Chinese Journal of Luminescence,2022,43(08):1227-1235. DOI: 10.37188/CJL.20220217.
自激活发光受到了研究人员的广泛关注,其中硼氮化物缺陷发光材料因毒性低、合成简单、结构多样性等优点,具有成为新一代LED用荧光粉的潜力,但是低热稳定性限制了其实际应用。本文采用高温固相一步法,通过部分取代LiSr
4
(BN
2
)
3
(LSBN)中的Sr,合成了一种新的LiSr
2
Ca
2
(BN
2
)
3
(LSCBN)发光材料。采用X射线衍射仪、扫描电子显微镜和荧光光谱仪对荧光粉的相组成、形貌和光学性质进行了表征。结果表明,所制备的样品LSBN为立方晶系,空间群
Im‐3m
。在紫外区域有较宽的激发带,发射光谱峰值位于561 nm,半峰宽度(FWHM)约为4 504 cm
-1
。LSCBN的发光强度是LSBN的的2倍。解释了LSCBN的发光机理,LSCBN荧光粉中存在替代式缺陷,在光激励下形成发光中心。变温光谱显示,150 ℃时,LSBN的发光强度为初始强度的17%,LSCBN的发光强度为初始强度的57%,超过了已报道的其他硼氮化物荧光粉。这种离子取代的方法能有效调控发光波长和增强荧光强度,改善热稳定性,为硼氮化物缺陷材料发光性能的改善提供了新的思路和应用前景。
Self-activated phosphors have received a lot of attention from researchers, among which nitridoborate defect phosphors have the potential to become a new generation of phosphors for LEDs due to low toxicity, simple synthesis, and structural diversity, but low thermal stability limits their practical applications. In this paper, a new LiSr
2
Ca
2
(BN
2
)
3
(LSCBN) phosphor was synthesized by partially replacing Sr in LiSr
4
(BN
2
)
3
(LSBN) using a high-temperature solid-phase one-step method. The phase composition, morphology, and optical properties of the phosphor were characterized by X-ray diffraction, scanning electron microscopy, and fluorescence spectrometry. The results show that the prepared sample LSBN is a cubic crystal system with the space group
Im‐3m
. It has a wide excitation band in the UV region, the peak of the emission spectrum is located at 561 nm, and the full width at half maximum(FWHM) is about 4 504 cm
-1
. The luminescence intensity of a LSCBN is twice that of a LSBN. In LSCBN, the partial replacement of Sr by Ca introduces substitutional defects that form new luminescence centers. In the temperature dependence PL spectra, the intensity of LSBN at 150 ℃ is 17% of the initial value, and LSCBN can maintain 57% of the initial intensity at 150 ℃, which exceeds other nitridoborate phosphors that have been reported. This ion-substitution method can effectively regulate the luminescence wavelength and enhance the luminous intensity, improve the thermal stability, and provide a new idea and application prospect for the improvement of the luminescence performance of defect-related nitridoborate phosphors.
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