The blue sea, the green trees, the multicolored flowers, the space we live in is a colorful world. With color, our life will be more colorful, and the colorful LEDs will also illuminate our world and change. Our life.
We all know that LED chip chips can manufacture LED chips of different colors due to different materials, different doping elements and different doping concentrations. Can we use only one color chip to make LED products of different colors? ?
The answer is certainly yes, because we can do anything, the answer is immediately revealed: the white-light scheme, that is, the scheme of violet or blue light + phosphor.
Can this be done, is the theory going up? We all know the three primary colors of RGB. By adjusting the ratio and brightness value of the three primary colors, different colors of light can be obtained. Similarly, different phosphors can also emit different wavelengths and spectra after excitation (as shown below), and select different phosphors. , adjust the ratio, after the violet light or blue LED chip excitation mixed light, you can get different color light products.
Development of a full range of EMC3030 white color light
EMC3030 full range of white color light
Spectral of different white color light
In addition to the above wavelengths, can other wavelengths of color light be done, I can tell you very responsibly, of course, we welcome custom wavelengths and spectra.
Someone will ask, what is the performance?
From the curve of the above figure, compared with the performance of white to yellow and monochromatic yellow light, as the temperature increases, the ratio of brightness to heat (105 ° C / 25 ° C), the brightness of monochromatic light is only about 40%. The maintenance rate of white to yellow light is as high as 83%, the wavelength and color coordinates are shifted, and the white to yellow is smaller. In summary, the white to yellow product is more stable and stable.
Compared with monochromatic light, why is the cold-heat ratio of white-colored light higher? The principle is as follows: The principle of LED illumination is that the electron/air in the excited state transitions from high energy level to low energy level, and is combined with hole/electron emission. Photon, the average total lifetime of carriers is determined by the average lifetime of radiative recombination (emission photons) and non-radiative recombination (heat generation at defects). As the temperature increases, the lattice vibration amplitude of the semiconductor increases. When the vibration energy is higher than a certain value, when the electron transitions from the excited state to the ground state, energy is exchanged with the lattice atom, non-radiative recombination occurs, and heat is generated. The probability of this process increases exponentially with increasing temperature. As the temperature increases, the lattice vibration increases, the impurity defects increase, resulting in an increase in semiconductor light absorption, and the internal quantum efficiency decreases as the temperature increases, resulting in a decrease in the luminous intensity of the chip. The white color light adopts the blue LED chip, the epitaxial material is GaInN, and the monochromatic optical chip epitaxial material is AlGaInP. Due to the different epitaxial materials, the AlGaInP lattice vibration and impurity defects are increased with the temperature compared with the material GaInN. It is more sensitive. As the temperature increases, the internal quantum efficiency decreases more and the luminous intensity is lower. Therefore, the cold and hot state of the white color light product, the maintenance rate of the luminous flux is higher, and the heat stability is better.
Schematic diagram of the energy level transition of a semiconductor
With monochromatic light products, does white-colored light only have these advantages, NO, NO, NO, their brightness is higher, and the cost is greatly reduced. However, white color light also has certain disadvantages, such as a wide half-wave width of the spectrum, which is mainly related to the phosphor excitation spectrum.
Spectral comparison of white to yellow and monochromatic yellow
Everyone must be very concerned about where these products are applied?
At present, white color light is widely used in automotive turn signals, taillights, plant lighting, wall washers, and stage lights due to its unique properties such as high power, high thermal stability and high reliability. You think it The application is limited to this, it is too low.
Mini Led and Micro LED are its future. When it comes to this, let's first talk about the development trend of LED Display applications. In recent years, we have seen the emergence of Mini-LED and Micro LED in the display field. Samsung is in the 51st International At the Consumer Electronics Show, the world's first 146-inch home modular TV, The Wall, features a frameless Micro LED modular technology that delivers brilliant colors, high resolution, and high-quality graphics. The look and feel of the TV screen has brought about a very high level of improvement.
The mixed light design of Mini LED and Micro LED is one of the important components. Its implementation methods are as follows:
1, RGB three-color LED method, RGB three primary colors through a certain ratio, apply different currents, control its brightness value, thus achieving the combination of the three primary colors, to achieve full-color display.
2, white color light scheme - violet or blue LED chip + quantum dot phosphor, ultraviolet or blue Mini-LED, Micro LED to stimulate red, green quantum dot phosphor, that is, blue to red, green, thus Realize RGB three-color ratio to achieve full-color display.
Quantum dots generally have a particle size between 1-10 nm, and have various chemical compositions. The nanoparticles composed of II-VI or III-V elements have high-power absorption-light-emitting efficiency and a narrow half-height width. Features such as wide absorption spectrum, high color purity and saturation, simple structure, thin and curlable. The development of quantum dot technology to solve the separation of red, green and blue colors and the uniformity of color has become one of the important problems in the development of quantum dots. At present, the technology adopted is the development of quantum dot technology by spin coating and spray coating technology.
Although the half-wavelength spectrum of conventional phosphors is relatively wide, quantum dot phosphors have poor material stability, high heat dissipation requirements, and require short sealing and short life. However, they have high heat compared with monochromatic light. Stability, high excitation efficiency, lower cost, with the advancement and maturity of technology, the UV-blue chip + phosphor white color conversion scheme will definitely shine in all areas of LED applications, white-colored The times will not be too far.
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