Is this answer true, if yes explain rephrase: Certain LEDs initiate phosphorescence and others do not because a photon's energy must exceed a minimum threshold for electrons to be excited, which is called the threshold frequency. Depending on the energy the color contains, it will determine if it initiates phosphorescence due to the excitement of electrons needed to 'activate' it. In my data, the red LED didn't provide enough energy per photon whereas the blue and UV light did. Therefore, the excitation needs to be great, and a higher intensity light should be used because phosphorescent emission continues even after the excitation ends