Introduction to the peak intensity of the luminescence spectrum of LED
The spectrum refers to the distribution of light intensity across different wavelengths. LEDs typically emit a narrowband spectrum, making them monochromatic. For example, a blue LED has a peak at around 470 nm, while ultraviolet LEDs have shorter peak wavelengths and green LEDs have longer ones. These extremes represent the measurement limits for light intensity. In contrast, incandescent lamps emit light over a broader range, from the blue region (above 400 nm) to near-infrared (above 700 nm), and can also emit in the ultraviolet and infrared regions.
Fluorescent lamps produce a spectrum that is determined by the phosphor materials used. Their emission peaks correspond to the wavelengths of the phosphor's luminescence. Unlike traditional red, green, and blue LEDs, which have single-peaked spectra, white LEDs often display multiple peaks. This is because white light is created by combining several wavelengths. For instance, when a blue LED is paired with a yellow phosphor, the resulting spectrum shows two peaks: one in the blue and another in the yellow. The blue LED’s peak is sharp, while the phosphor’s peak is broader.
When LEDs are used as backlights for liquid crystal displays (LCDs), it is ideal for their spectrum to peak in the red, green, and blue regions. This is because the light passes through color filters (red, green, blue) on the LCD panel before being seen by the viewer.
To achieve three distinct peaks, manufacturers can either use separate red, green, and blue LEDs or develop a white LED that emits multiple peaks by improving its phosphor material.
Comparing the luminescence spectra of blue LEDs with YAG-based phosphors, blue LEDs with ZnSe substrates, and white LEDs using UV LEDs and RGB phosphors, we see significant differences compared to fluorescent lamps and natural sunlight. Although all may appear white, their spectral distributions vary widely. When used in general lighting, white LEDs with broad visible spectra are more popular, as they better mimic natural daylight. This results in more accurate color rendering when objects are illuminated under LED light, similar to how they appear under sunlight.
Lixun Electronic Technology (Shanghai) Co., Ltd. is a wholly-owned subsidiary of Litian Group, specializing in the production, R&D, and sales of LED testing instruments. With a global presence, Litian Group has exhibition halls in Europe, the USA, Russia, India, and South Korea, as well as sales representatives and research centers. In Shanghai, the company maintains a world-class lighting inspection laboratory, ensuring high-quality standards in all its products.
phone case custom,phone case designs,phone case decorations,business phone case
Dongguan Yingxin Technology Co., Ltd. , https://www.dgyingxintech.com