In 2015, Professor Ali Javey of the School of Electrical Engineering and Computer Science at the University of California, Berkeley, published a paper in the journal Science, revealing the use of monolayer semiconductors to make ultra-thin The possibility of LEDs. However, at that time, if the size of a single-layer semiconductor was enlarged, the thickness of the single-layer semiconductor would also increase at the same time, and the real application was limited. Recently, the team said that it has successfully made LEDs that can extend the length and width without affecting the thickness, and only three atoms thick. The new findings have been published in the journal Nature Communications. LEDs When a voltage is applied to the LEDs, the electrons reach an excited state and then decay back to the ground state when they meet the hole at the point of contact, while releasing the energy in the form of light. This is how LEDs work. Therefore, the most difficult problem in improving the luminous efficiency of LEDs is how to make free electrons and holes more efficient. Especially when the size of the semiconductor is only a single layer thickness, there are not many materials that can be used, which makes the difficulty more. Single layer semiconductor The researchers used transition-metal dichalcogenides (TMDCs) to make single-layer semiconductors, which have semiconductor properties similar to those of graphene and are considered to be important photovoltaic materials for the next generation. Then, a gate and a source are placed on the upper and lower sides of the semiconductor to form LEDs. When the alternating current is connected between the gate and the source, free electrons and holes are simultaneously present in the middle of the single-layer semiconductor. It causes energy to be released as light. â–² The configuration of this LEDs. (Photo: Ali Javey) future development At present, there are still many places in this LEDs that need continuous improvement. In particular, their energy efficiency is currently only 1%, which is far less than the 25-30% of the market. But as Der-Hsien Lien, a postdoctoral researcher in his research team, said: "This material is quite thin and flexible, so it can be made transparent and applied to curved surfaces." At present, transparent displays have become a new target in the scientific and technological community, and the results of this research will have a considerable impact. In addition, it has been studied to produce high-quality TMDCs in large quantities through chemical vapor deposition, so it is expected to solve the physical limit problems faced by current integrated circuits by virtue of their characteristics.
Learning Machine speaker:
Learning Machine speaker is a kind of micro speaker unit which uses a diaphragm made of Mylar material. Mylar speakers are of ultrathin design and lightweight and clear voice. It is widely used in education industry (storyteller, voice E-book, repeater, reading pen-).
There are two types of Mylar speakers from the shapes:
1) Round shapes, we have products from 10mm to 57mm in diameter.
2) Oblong shape, we have products in sizes of 1510/1712/1813-..
FAQ
Q1. What is the MOQ? Learning Machine Speaker,Reading Pen Speaker,Story Machine Speaker,Stereo Speakers Shenzhen Xuanda Electronics Co., Ltd. , https://www.xdecspeaker.com
XDEC: 2000pcs for one model.
Q2. What is the delivery lead time?
XDEC: 15 days for normal orders, 10 days for urgent orders.
Q3. What are the payment methods?
XDEC: T/T, PayPal, Western Union, Money Gram.
Q4. Can you offer samples for testing?
XDEC: Yes, we offer free samples.
Q5. How soon can you send samples?
XDEC: We can send samples in 3-5 days.