2026年4月托福机经套卷(第1套) - Read an Academic Passage Q2

Quantum Dots Quantum dots are tiny semiconductor particles with unique optical properties, making them valuable in display technology. When exposed to light, these nanoparticles emit bright, pure colors that can be finely tuned by varying their size. This allows for more vibrant and accurate colors in screens, surpassing traditional display technologies. Their application in displays has revolutionized the consumer electronics industry. For example, quantum dot-enhanced televisions offer a broader color spectrum and energy conservation compared to conventional light-emitting diode (LED) displays because they require less backlighting. Environmental benefits are another advantage. Traditional displays often use harmful heavy metals like cadmium and lead. Quantum dots can be made from less toxic materials, and researchers are working on cadmium-free quantum dots to further reduce environmental impact. The manufacture of quantum dots requires extreme precision. As a result, challenges remain in scaling up production. However, this is a worthwhile endeavor because quantum dots potentially have many applications outside of electronics, such as in biological research. Their small size and bright emission are ideal for tagging and tracking molecules in living organisms. This allows for long-term observation of dynamic biological processes.