Systems and methods for detecting ultraviolet light using image sensors

摘要

An imaging system may include an image sensor having an array of image pixels with a photosensitive region that generates image signals in response to light. The array may include photoluminescent material that absorbs light of a first range of wavelengths and emits light of a second range of wavelengths onto the photosensitive region. The first range of wavelengths may correspond to ultraviolet light, and the second range of wavelengths may correspond to visible light. The photoluminescent material may be formed over some or all of the image pixels. The array may include color filter elements that transmit light of a given color to the photosensitive region. The photoluminescent material may be adjusted to have a peak emission intensity at a color of light that corresponds to the given color of light transmitted by a given color filter element.

主权项

1. An image sensor, comprising:
an array of image pixels arranged in rows and columns, wherein the array of image pixels comprises:
a layer of photosensitive material;a layer of light-emitting material that emits light onto the layer of photosensitive material, wherein the layer of photosensitive material is configured to generate electrical signals in response to at least the light emitted by the layer of light-emitting material;microlens structures having upper and lower surfaces; anda color filter layer formed between the layer of photosensitive material and the lower surface of the microlens structures, wherein the color filter layer comprises an array of color filter elements, wherein a first color filter element in the array of color filter elements transmits light of a first wavelength band to a first portion of the layer of photosensitive material corresponding to a first image pixel in the array of image pixels, and wherein a first portion of the layer of light-emitting material formed over the first portion of the layer of photosensitive material is configured to emit light in the first wavelength band, wherein a second color filter element in the array of color filter elements transmits light of a second wavelength band that is different from the first wavelength band to a second portion of the layer of photosensitive material corresponding to a second image pixel in the array of image pixels, and wherein a second portion of the layer of light-emitting material formed over the second portion of the layer of photosensitive material is configured to emit light in the second wavelength band.