Chenyang Li, Yimin Zhou, Fei Tang, Yizhuo Chen, Kangzhen Tian, Bo Zhao and Shijie Xu
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引用次数: 0
摘要
在健康照明领域的固态照明应用中,对具有高效率和优异热稳定性的远红外(FR)发射(700 纳米)有着极大的需求。然而,目前使用的远红外材料往往面临合成复杂、效率低、热不稳定等挑战。在本研究中,我们提出了一种高效且热稳定的远红荧光粉--Mn4+激活的 La1-xCaxAlO3-yFy ,其主要发射波长为 731 nm。在此基础上,利用胶带铸造工艺结合低温共烧技术制备了一种超薄荧光粉-玻璃复合材料(PGC),其荧光量子产率为 68.2%。研究了离子取代对晶体结构和发光特性的影响,以确定最佳掺杂条件。有趣的是,我们观察到制备的 PGC 显示出与 FR 荧光粉不同的随温度变化的发光特性。经测量,PGC 的发光寿命接近 3.576 毫秒,与纯荧光粉相比减少了 28.4%。最终,通过将 PGC 与紫光芯片相结合,制造出了发光二极管 (LED),其电致发光 (EL) 特性在很大程度上取决于 PGC 复合材料的配置。这项研究为生产超薄远红外 PGC 提供了一种直接而多用途的方法,有望用于各种光子应用。
Achieving high brightness and thermally stable far-red luminescence via ultrathin phosphor–glass composite engineering
Far-red (FR) emission (>700 nm) with high efficiency and excellent thermal stability is in great demand for solid-state lighting applications in health illumination. However, currently used FR materials often face challenges such as complex synthesis, low efficiency, and thermal instability. In this study, we present a highly efficient and thermally stable far-red phosphor, Mn4+-activated La1−xCaxAlO3−yFy, with a dominant emission wavelength of 731 nm. Based on this, an ultrathin phosphor–glass composite (PGC), with a FR luminescence quantum yield of 68.2%, is prepared using a tape-casting process combined with a low-temperature cofiring technique. The impact of ionic substitution on the crystal structure and luminescence properties is examined to establish the optimal doping conditions. Interestingly, we observed that the prepared PGC exhibits temperature-dependent luminescence distinct from that of FR phosphor. The luminescence lifetime for the PGC is measured to be nearly 3.576 ms, representing a 28.4% decrease compared to that of the pure phosphor. Ultimately, light-emitting diodes (LEDs) are fabricated by combining the PGC with a violet chip, and their electroluminescence (EL) properties are strongly dependent on the configuration of the PGC composite. This research offers a straightforward and versatile method for producing ultrathin far-red PGCs that hold promise for diverse photonic applications.
期刊介绍:
The Journal of Materials Chemistry is divided into three distinct sections, A, B, and C, each catering to specific applications of the materials under study:
Journal of Materials Chemistry A focuses primarily on materials intended for applications in energy and sustainability.
Journal of Materials Chemistry B specializes in materials designed for applications in biology and medicine.
Journal of Materials Chemistry C is dedicated to materials suitable for applications in optical, magnetic, and electronic devices.
Example topic areas within the scope of Journal of Materials Chemistry C are listed below. This list is neither exhaustive nor exclusive.
Bioelectronics
Conductors
Detectors
Dielectrics
Displays
Ferroelectrics
Lasers
LEDs
Lighting
Liquid crystals
Memory
Metamaterials
Multiferroics
Photonics
Photovoltaics
Semiconductors
Sensors
Single molecule conductors
Spintronics
Superconductors
Thermoelectrics
Topological insulators
Transistors