A systematic review on 1,8-naphthalimide derivatives as emissive materials in organic light-emitting diodes

Organic light-emitting devices (OLEDs) have garnered significant research attention owing to their immense application prospects in leading technologies for full-color flat panel displays and eco-friendly solid-state lighting. They demonstrate exceptional features such as mercury-free construction, wide viewing angle, superior color quality and captivating flexibility. The requirements of light-emitting organic materials pertaining to high stability, lifetime and luminescence quantum yield, combined with the fabrication of devices with high performance efficiency, are highly challenging. Rational molecular design of 1,8-naphthalimide (NI) derivatives can offer quite promising results in achieving standard-light-emitting materials with a wide range of colors for OLED applications. This review is mainly focused on the synthesis and usage of varyingly substituted NI frameworks as luminescent host, dopant, hole-blocking and electron-transporting materials for OLEDs that emit not only red, orange, green and blue colors, but also function as white emitters, which can really have an impact on reducing the energy consumption. The future prospects that could be explored to improve the research in the highly promising field of OLEDs are also discussed. Graphical abstract

VR 360 as an Alternative for Virtual-Based Practicum Learning with Stereoscopic View

School education especially on primary school have a big impact to the children. Good and right education can sharpening the brain and influence the student with good attitude. Every information that attractive and easy to understanding is very important to give big impact for every primary school student, it also can provide a pleasant learning experience for these students. Therefore, this research develops a smartphone application that can provide a pleasant experience in learning knowledge of the surrounding environment from objects with virtual reality technology. To display these objects, a 360 ° panoramic image is used or a 2048px width 1024px width with a wide viewing angle (360 degrees) and this can be done by teachers to make the image or search for material sources on the internet. This technology allows students to see objects virtually. In use, this study requires a VR headset as a device for visualizing stereoscopic displays but it does not need installation because it is enough to access a smartphone browser then it will work. The system is designed using the spiral method as a process model and uses a-frame in application development. The interface can be run on the Android operating system. In making this application using the html programming language, laravel framework and a-frame framework.

Forensic Engineering Analysis of Video Screens for a Dispute Over Requirements and Specifications

This case was about LCD video screens intended to become components of medical equipment requiring an ultra-wide viewing angle. The seller was a wholesaler of various types of video screens from multiple manufacturers. The buyer was a distributor of multiple electrical components for various industries. The OEM, not involved in the case, was a manufacturer of medical instruments and equipment. Claiming that multiple units did not meet the requirements specified in the purchase agreement, the OEM refused a shipment of 1,000 LCD video screens. The buyer had already paid the seller, who refused to take back the shipment and issue a refund or credit. As a result, the buyer sued seller, and the author investigated and submitted expert opinions regarding the following questions: Did performance differ between examined samples? Did each sample meet data sheet specification for viewing angle? And was each sample adequate for its intended application as advertised in the datasheet (that is, for industrial settings requiring ultra-wide viewing angle)?

Electro-Optical Full-Color Display Based on Nano-Particle Dispersions

Electrokinetic displays are among the most important display technologies because of their low power consumption, wide viewing angle, and outdoor readability. As a result, they are regarded as excellent candidates for electronic paper. These types of displays are based on the controlled movement of charged pigment particles in a non-polar liquid under the influence of an electric field. Free charges practically do not exist in nonpolar colloids due to their low dielectric constant. However, the addition of a surfactant to non-polar colloids often leads to considerable charge-induced effects, such as increased electrical conductivity and particle stabilization. In this project, we aim to develop a novel electrokinetically driven display. An unprecedented display device is proposed, based on the concerted action of electro-osmosis and electrophoresis in a non-polar fluid. This method could reduce the switching time required to display information, and extend the applications of electrokinetic displays, enabling increased video speed and full color in the future.