Stable CsPbBr₃‐Glass Nanocomposite for Low‐Étendue Wide‐Color‐Gamut Laser‐Driven Projection Display

Abstract

Up-to-date laser-driven projection technology puts an urgent demand for green phosphor with stringent requirements on its performance. Herein, by virtue of a new architecture design based on CsPbBr 3 -glass nanocomposite, i.e., CsPbBr 3 glass ceramic film sintered on sapphire plate, the application availability of this famous green-emitting phosphor is demonstrated in laser-driven projection. The mono-dispersed perovskite CsPbBr 3 nanostructure in amorphous glass matrix and the negligible thermal corrosion during co-sintering with low-melting-glass ensure good luminescent properties. The robust glass host and the carried sapphire substrate with high thermal conductivity contribute to good resistances to thermal shock, moisture, and blue laser irradiation. It is revealed that the thermal accumulation effect is relieved due to the pulsed excitation of rotatory "phosphor wheel," and so the luminescence saturation threshold gets increased. The constructed prototype lighting source yields a low étendue of ≈0.41 mm 2 , a wide color gamut of 128.4% NTSC (95.9% Rec. 2020), and a moderate luminous flux of 174 lm. The present work highlights an unprecedented design that makes the seemingly impossible application of CsPbBr 3 come true.

High‐Resolution X‐Ray Time‐Lapse Imaging from Fluoride Nanocrystals Embedded in Glass Matrix

“…This attribute benefits from the excellent weather resistance of the robust glass matrix. [21][22][23] Herein, an X-ray imaging system with a Nikon digital camera and TDF-3000 Focus diffractometer X-ray source is constructed as illustrated in Figure 2g. The prototype X-ray imager gives detailed structural information of the target transistor panel with a high resolution for the 40 kV, 30 mA X-ray irradiation (Figure 2h).…”

75MW AC PV Module Field Anomaly Detection Using Drone-Based IR Orthogonal Images With Res-CNN3 Detector

“…All the images are captured in 640 × 512 scale and contain formats of RGB, infrared and orthogonal images. The selection of the IR orthogonal images is based on the analyses of the behavior of infrared light and irradiation through glass surfaces [28]. This behavior aids in the analyses and observation of anomalies on the front surface among glass matrix, which is a good application in optics, laser and photonics.…”

Laser speckle reduction via TiO2‐sapphire composite rotating wheel in laser projection

“…For a projector, the lighting source is of vital importance that determines the system efficiency and image quality, and its update is always accompanied by the emergence of a new generation of products. [1][2][3][4] Traditional lighting sources such as mercury lamps and xenon lamps, achieving success in high lumen output, but failing in system efficiency and color quality, have been gradually replaced by solid-state semiconductor light sources (i.e., light-emitting diode (LED) and laser diode (LD)). 5,6 Especially for LD, the projection system using RGB laser source provides a wide color gamut for vivid image, ultra-high brightness and high contrast for the best image quality, low power consumption for green environment, and long lifetime for maintenance-free operation.…”

“…2 In this work, a TiO 2 -sapphire composite (TSC) with rough and high reflectivity surface and high thermal conductivity substrate is designed and fabricated to reduce the laser speckle. 4,[29][30][31][32] When the coherent blue laser falls on the random surface of the TSC, lambert scattering occurs, which creates spatial diversity and splits the laser beam into multiple paths with sufficient optical path differences, thereby generating independent speckle patterns. The reduction of speckle is achieved by averaging the independent speckle patterns.…”

“…Projectors have been widely integrated into people's daily life. For a projector, the lighting source is of vital importance that determines the system efficiency and image quality, and its update is always accompanied by the emergence of a new generation of products 1–4 . Traditional lighting sources such as mercury lamps and xenon lamps, achieving success in high lumen output, but failing in system efficiency and color quality, have been gradually replaced by solid‐state semiconductor light sources (i.e., light‐emitting diode (LED) and laser diode (LD)) 5,6 .…”