- 4 Semiconductor Led Chips Are Commonly Coated With Any Optically Transparent Encapsulant Assume That The Refractive In 1 (57.98 KiB) Viewed 41 times
4. Semiconductor LED chips are commonly coated with any optically transparent encapsulant. Assume that the refractive in
-
answerhappygod
- Site Admin
- Posts: 899604
- Joined: Mon Aug 02, 2021 8:13 am
4. Semiconductor LED chips are commonly coated with any optically transparent encapsulant. Assume that the refractive in
4. Semiconductor LED chips are commonly coated with any optically transparent encapsulant. Assume that the refractive index of the encapsulant is n=1.6 a. What is the reason for using an encapsulant b. Calculate the reflectance at the encapsulant-air boundary (Assume normal incidence) c. To reduce reflectance at the encapsulant-air boundary, one can use a second encapsulant forming a thin layer on top of the first encapsulant. The second encapsulant has a refractive index n2. Sketch the device having both encapsulants. d. Assume the reflectances of the two interfaces add up (R-Ri+R2). Give a formula for the total reflectance as a function of nz. e. Calculate the optimum value of n, that will minimize total reflection.
Join a community of subject matter experts. Register for FREE to view solutions, replies, and use search function. Request answer by replying!