Red Light-Emitting Nitride Material for High Efficiency
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Solution Overview
Problem
Traditional red light-emitting nitride materials face challenges in achieving high light-emitting efficiency, good temperature properties, and wide half-widths, which are essential for modern applications such as 3D displays and white LEDs, with existing materials showing reduced efficiency and limited color rendering indexes.
Innovation Solution
A red light-emitting nitride material with the structure Ma(Al,B)bSicNdOe:Eum, Rn, where M is Mg, Ca, Sr, or Ba, R is a rare earth element, and specific molar ratios are used to enhance light-emitting efficiency, temperature stability, and half-width, incorporating elements like aluminum, boron, and oxygen to improve crystallinity and emission spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional red light-emitting materials (Y2O3:Eu3+, Y2O2S:Eu3+, (Ca,Sr)S:Eu2+) are used, then the materials have been widely applied in traditional display and illumination, but they fail to meet the needs of new technologies (3D display, white LED) due to low light-emitting efficiency and poor temperature properties
Solution Approach 1:
The patent changes the chemical composition parameters by introducing Al and B elements into the CaSiN2:Eu phosphor system, creating a new compound with optimized crystal structure and electronic properties that simultaneously improves light-emitting efficiency and temperature stability
Solution Approach 2:
The patent creates a composite phosphor material combining multiple elements (Ca, Si, N, Al, B, Eu) in specific ratios to achieve synergistic effects that enhance both luminous efficiency and thermal stability beyond what single-element phosphors can provide
2Illumination intensity
If red light-emitting materials with narrow emission spectra are used to improve color rendering index, then the color rendering index can be improved, but the overall light-emitting efficiency of the device is greatly reduced
Solution Approach 1:
The patent optimizes the emission spectrum parameters by adjusting the Al and B content in the phosphor composition, achieving a balance between spectral width (for color rendering) and emission intensity (for efficiency), with the emission half-width controlled in the range of 80-120 nm
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed red light-emitting nitride material exhibits high light-emitting efficiency, good temperature properties, and a wider half-width, leading to improved luminance and color rendering indexes, addressing the limitations of traditional materials.
Implementation Method 1
A red light-emitting nitride material... excitation spectra of the light-emitting materials move towards longer wavelengths including near ultraviolet and visible light etc.
Implementation Method 2
substrates of the light-emitting materials are provided with relatively dense network structures having stable physicochemical properties
Data Source
AI summary
Disclosed are a red light-emitting nitride material, a light-emitting part and a light-emitting device comprising the same. The General Formula of the light-emitting material is: Ma(Al,B)bSicNdOe:Eum, Rn, wherein M is at least one of the alkaline earth metal elements Mg, Ca, Sr, Ba and Zn; R is at least one of the rare earth elements Y, La, Ce, Gd and Lu; and 0.9≦a<1.1, 0.9≦b≦1, 1≦c≦1.5, 2.5<d<5, 0<e<0.1, 0<m<0.05, 0<n<0.1 and 1<c/b<1.5. The light-emitting material can be effectively excited by a radiation light having a wavelength below 500 nm, and then emits a visible red light having a wide spectrum from 500 nm to 780 nm. The light-emitting material of the present disclosure has the characteristics of high light-emitting efficiency, good temperature properties and a wide half-width etc., and the material can be used alone or in combination with other light-emitting materials for making high performance light-emitting devices.