Ultrastable low-cost colloidal quantum dot microlasers

High-performance micro- / nanostructured lasers as multi-performance optical source components are of great importance for optoelectronic devices. Towards this goal, scientists in China invented a high-efficiency ultrasound low-cost quantum dot microlaser, which can also be operated at 450 K, the highest operating temperature for a quantum dot laser.

The innovative technology significantly promotes its development from basal performance studies to high-temperature low-cost microlasers and senior practical compatibility for predictive commercialization.

Low-dimensional colloidal quantum dots (CQDs) have gained significant attention due to their unique structures, exceptional optical properties, and low-cost preparation procedures. Since their first synthesis in the 1990s, the motivation to realize high-performance low-cost CQD micro / nanolors has been a driving force for more than three decades.

However, the low packing density of CQDs with optical cavities, inefficient coupling, and poor thermal stability of small unsaturated complex systems make it challenging to obtain practical CQD micro / nanolors, especially at high temperatures and low continuous work efficiencies. To combine.

Cost efficiencies with mass-produced synthesis technologies. Therefore, to solve the above mentioned key problems efficiently, new ideas aside from traditional CQD laser research are needed.

In a new paper published in Optics and Applications, a team of scientists, led by Professor Honxing Dong and Professor Long Zhang, from the Main Laboratory of Materials High-Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China , And co-personnel have developed a novel assembly technique combined with the sol – gel method to fabricate CQD-assembled microcephasers (CQDAMs) that solidify in a silica matrix, which not only guarantees that CQDAMS high temperatures But works steadily, but also solves problems. Achieving packing density and coupling efficiency.

The researchers first achieved single-mode lacing based on solid CQDAMs with operative temperatures above 450 K. Even if they continuously operate in such a high-temperature environment, a stable output of lasing pulses can be maintained for up to 40 minutes. By changing the structure and / or size of the CQD, single-mode lacing can be extended to the entire visual spectral range. In addition, the solution-processable method has the advantages of low cost and capacity for mass production.

This does not require complex optical cavity processing, meaning that no expensive equipment or extremely complex processing is required. Meanwhile, these CQDAMs lasers can be highly integrated into a micro-substrate, and can also be applied to other types of semiconductor nanoparticles, which approximate commercial application value in high-temperature low-cost micro-integrated optoelectronic devices. Promote.

In the research field of micro- / nanolors devices, high-performance low-cost CQD lasers are an important hot topic. Unfortunately, the development is clearly hystericatic given the coexistence of multilevel challenges, namely, (1) a baseline requirement of excellent leasing performance; (2) Continuous working with high stability such as propagation ability to meet the application conditions, applicability in high temperature environments; (3) A combination of low-cost production gains and the attributes in the preceding points (1), (2).

“From the point of view of the gain medium, self-assembled CQDs reach a high threshold of packing density, achieving almost sufficient density. From the point of view of light-matter coupling, such CQDAM samples are used as both gain material and optical Microcavities, a complete improvement in light-matter coupling efficiency.

From the point of view of optical cavity performance, spherical WGM microcavity can effectively improve the boundary potential of cavity photons. CQDAM samples of a volume of about 1 μm-3 For, there may be. Only one resonant mode is effective in the emission wavelength range. However, the Q factor of the operative mode can be 104. Most importantly, we combine these three benefits of different aspects in the CQDAM sample together Huh. ”

“In addition to the above laser parameters, lacing stability at high temperatures is also an important aspect related to commercialization capability. The heat dissipation problem is an intrinsic and unavoidable difficulty for next-generation microchip-integrated leasing devices. In this work, the operative. CQD microlaser The temperature is displayed at 450 K. In addition, CQDs microlezers can be integrated with excellent workability even at such high temperatures.

In other words, this highly efficient solution-preparation processes do not require complex processing techniques and expensive processing equipment, the cost being mainly low-cost materials. This cost-effective manufacturing and flexible integration capability paves a new path and promises a huge potential in the advancement of CQD microllers from laboratory to industrialization, ”he said.

“Furthermore, ever since the first exposure to excitatory emission from CQD, the pursuit of electrically pumped CQD lasings has become the subject of intense research. Interestingly, our CQDAMs form both a gain medium and an optical cavity. , Which can be easily.

Incorporated into electroluminescent architecture as an emitting layer to enable electrically pumped nanolors. In fact, the realization of electro-induced micro-lasers is a major challenge. Is, there is a need to solve more complex problems, which is also an important part of our future research., “Scientists predict.

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