Engineering CsPbX₃ (X = Cl, Br, I) Quantum Dot-Embedded Borosilicate Glass through Self-Crystallization Facilitated by NaF as a Phosphor for Full-Color Illumination and Laser-Driven Projection Displays

Abstract

All inorganic perovskite (CsPbX 3 , X = Cl, Br, I) quantum dot (QD) glass samples are considered the next generation of lighting materials for their excellent luminescence properties and stability, but crystallization conditions are difficult to control, which often leads to the inhomogeneous crystallinity of QDs. Here, we provided evidence that the presence of sodium fluoride induced self-crystallization of CsPbBr 3 QDs during routine glass formation without the need for additional heat treatment. We showed that NaF simultaneously affected the network structure of glass and promoted the formation of CsPbBr 3 QDs, that is, Na + ions entered the glass network skeleton, partially interrupting the network structure, while the strong electronegativity of F − ions attracted Cs + and Pb 2+ ions into the gaps formed in the glass networks that had been loosened up by Na + ions, which reduced the activation energy of crystallization processes. Our results showed that NaF-induced CsPbBr 3 QDs glass had excellent thermal stability, high photoluminescence quantum efficiency (49%), and luminescent stability under high-power laser irradiation. Finally, this work also demonstrated the general applicability of this method in the making of a series of CsPbX 3 (X = Cl, Br, I) QD glass samples by NaF-induced self-crystallization, which drastically expanded the color gamut to a range of full spectrum for luminescence and laser-driven projection displays. We believe that the work presented here represents a new direction for the research and development of full-color gamut inorganic perovskite quantum dot glass samples, which could have a significant impact on the future applications of laser-driven projection displays as well.

Strategy of Charge Compensation for High-Performance Ni2+-Activated MgAl2O4 Spinel Near-Infrared Phosphor Synthesis via the Sol–Gel Combustion Method

“…To circumvent the issue of serious heat accumulation under high-power density, alaser diode (LD), which has advantages in compactness, brightness, and efficiency over LED chips, is gradually replacing LED as the alternative excitation light source. − We tested the feasibility of excitation using a high-power laser. The luminescence properties of Zr 4+ /Ni 2+ codoped MgAl 2 O 4 phosphors were excited with a monochromatic continuous wavelength (CW) laser with λ ex = 360 nm.…”

Achieving Broadband NIR-I to NIR-II Emission in an All-Inorganic Halide Double-Perovskite Cs2NaYCl6:Cr3+ Phosphor for Night Vision Imaging

“…We prepared a NIR pc-LED device using the optimal Cs 2 NaYCl 6 :0.01Cr 3+ phosphor and a commercial 310 nm ultraviolet LED chip. The use of pc-LEDs greatly simplifies the construction of NIR devices and reduces the production cost; this method has become the focus of the current research. − Also, well controlling the concentration of Cr 3+ and adjusting the thickness of the emitting phosphor to the minimum reduce the leakage of the UV light. A heat-dissipating aluminum plate was soldered to the back of the ultraviolet chip to ensure the high performance of the LED device.…”

Synergistic enhancement of the near-infrared luminescence properties of Ni2+-doped SrTiO3 perovskite phosphors and their application

“…To avoid the serious heat accumulation under high power density excitation, laser diode (LD) lighting has more advantages in terms of volume, brightness, and efficiency, and is expected to replace LED lighting. 35,36 We measured the laser-driven NIR luminescence from the SrTiO 3 –Ni 2+ –Yb 3+ –Ta 5+ phosphor using a lab-built optical setup in a reflection configuration, as shown in Fig. 8a.…”