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Color rendering performance is an important indicator for evaluating the quality of LED light sources, which determines the degree of color reduction of the light source. The CIE specifies that the color rendering index is divided into a general color rendering index (Ra) and a special color rendering index (Ri). A set of 14 test standard color samples were used for the evaluation: R1, light gray red; R2, dark grayish yellow; R3: saturated yellowish green; R4, medium yellowish green; R5, light blue-green; R6, light blue; Pale blue; R8, reddish purple; R9, saturated red; R10, saturated yellow; R11, saturated green; R12, saturated blue; R13, Caucasian complexion; Among them, 1 to 8 test colors are used for the calculation of the general color rendering index Ra, and Ra is the average value of R1 to R8; the latter 6 test colors are used to calculate the color rendering index of the special color.
It can be seen from the color types represented by R1~R8 that the Ra value is more correlated with blue, yellow and green, which can better reflect the display of the green and blue parts of the light source, and the Ra value cannot truly represent the red color. Show the situation. The R9 value represents saturated red, which best reflects the display of the red portion of the light source. The larger the value, the better the redness to red. Many reports and experiments have confirmed that the higher the R9 value of the lamp, the better the effect of the fruit, flowers and other occasions, and the color is more vivid and true.
"Fluorescent powder is the key factor determining the color rendering performance of white LED light source. Without good phosphor, there will be no high color rendering white LED light source. The traditional LED blue chip is coated with aluminate yellow powder technology solution, Ra can only do it. 70-75, Ra should be increased to 80 or higher, it is necessary to add red powder and green powder." Dr. Liu Ronghui, research and development department of rare earth luminescence, said that rare earth in the industry is committed to high-efficiency yellow-green powder with red powder In order to achieve high color rendering, and put forward the industry's well-known "do high display, find research" strategy.
According to Dr. Liu Ronghui, in 2014, for the application of high color rendering LEDs, especially for the high price of Lu-YAG green powder on the market, the color effect was sacrificed by narrowing the nitride half-peak to ensure the light effect (especially the shortage of R9) The common problem of the industry, Rare Earth focuses on the introduction of small-grain, high-brightness, low-cost Ga-YAG green phosphors, as well as nitrided red powder phosphors with broad spectral emission characteristics and light efficiency. The device has a Ra range of 80-90 and a R9 value of up to 90, and has a comprehensive advantage of low powder consumption and high light efficiency, and is currently widely spread on the market. This time, the Rare Earth Rather High R9 White Light Series Phosphor will compete for the 2014 Golden Globe Award.
It is understood that Rare Earth has obtained more than 20 invention patents including the United States, Japan and South Korea in the field of LED phosphors, and developed more than 40 high-performance phosphors covering various color bands. The technical achievements were selected twice in China. “Top Ten Technology News of Rare Earthsâ€, responsible for the formulation of major national and industry standards in the field of LED phosphors, and won the “High-tech LED Golden Globe Award†for two consecutive years in 2012 and 2013.
At present, the 2014 (5th) High-tech Golden Globe Award - the annual LED good product selection has entered the WeChat voting stage: August 8 - September 30.
If you have already paid attention to the official WeChat LED, please click on the menu bar "Golden Ball Award - I want to vote" under the official WeChat of Gaogong LED Network to vote.
If you have not paid attention to the high-tech LED WeChat, please pay attention to the official WeChat (micro-signal: weixin-gg-led) of Gaogong LED network, and then click on the menu bar "Golden Ball Award - I want to vote" under the official WeChat LED official website. . 
Research Rare Earth: High R9 White Light Series Phosphors Compete for 2014 High Engineering Golden Globe Award
[Text|High-tech LED reporter Yue Mengdi] With the accelerated penetration of white LEDs (semiconductors) in the field of indoor lighting, the performance requirements for white LED light sources must be purely pursuing "high brightness" conversion and taking into account performance parameters such as color rendering performance and color temperature. "High quality".