PN结电致发光

This is a fundamental equation in quantum mechanics that describes how the quantum state of a physical system changes over time. It is a linear partial differential equation for the wavefunction, [latex]\Psi(x, t)[/latex]. The time-dependent version is [latex]i\hbar\frac{\partial}{\partial t}\Psi = \hat{H}\Psi[/latex], where [latex]\hat{H}[/latex] is the Hamiltonian operator, representing the total energy of the system.

In quantum mechanics, momentum is an observable represented by a vector operator. In the position basis, the momentum operator is given by [latex]\hat{\vec{p}} = -i\hbar\nabla[/latex], where [latex]\hbar[/latex] is the reduced Planck constant and [latex]\nabla[/latex] is the gradient operator. The conservation of momentum corresponds to the fact that the Hamiltonian operator commutes with the momentum operator, [latex][\hat{H}, \hat{\vec{p}}] = 0[/latex], for a system with translational symmetry.

It is impossible to simultaneously know with perfect accuracy certain pairs of complementary physical properties of a particle. The most common example is the position [latex]x[/latex] and momentum [latex]p[/latex]. The principle states that the product of their uncertainties, [latex]\Delta x[/latex] and [latex]\Delta p[/latex], must be greater than or equal to a specific value: [latex]\Delta x \Delta p \ge \frac{\hbar}{2}[/latex].

Electrochemical potential, [latex]\bar{\mu}_i[/latex], quantifies the total energy of a charged species `i` in a system. It combines the chemical potential, [latex]\mu_i[/latex], which accounts for concentration and intrinsic properties, with the electrostatic potential energy, [latex]z_i F \phi[/latex]. The formula is [latex]\bar{\mu}_i = \mu_i + z_i F \phi[/latex], where [latex]z_i[/latex] is the ion's charge, [latex]F[/latex] is the Faraday constant, and [latex]phi[/latex] is the local electric potential.

相关色温 (CCT) 是衡量非理想黑体辐射光源（例如 LED 或荧光灯）色温的指标。它是指与光源颜色感知最接近的普朗克辐射体的温度。这种“接近度”是通过在普朗克轨迹上找到距离光源色度坐标最近的点来确定的。

镧系收缩是指镧系元素（从镧到镥）的原子半径和离子半径随着原子序数的增加而逐渐减小的现象。这种效应是由于4f电子对核电荷的屏蔽作用较弱造成的。这导致镧系元素之后的第六周期元素意外地小，与第五周期元素相似。

Quantum statistics modifies classical statistical mechanics to account for the indistinguishability of identical particles. It splits into two types: Fermi-Dirac statistics for fermions (half-integer spin particles like electrons), which obey the Pauli exclusion principle, and Bose-Einstein statistics for bosons (integer spin particles like photons), which can occupy the same quantum state. This distinction is crucial at low temperatures and high densities.

触变性和流变性描述的是粘度随时间的变化。触变性流体的粘度在恒定的剪切应力下会随时间降低（例如，酸奶在搅拌时会变得更稀）。流变性（或抗触变性）流体的粘度在恒定的剪切应力下会随时间增加（例如，某些润滑剂）。这些效应是可逆的；流体在静置一段时间后会恢复到原始状态。

A quantum mechanical phenomenon where a wavefunction can propagate through a potential energy barrier. Classically, a particle lacking sufficient energy to surmount a barrier would be reflected. However, due to the wave-like nature of particles, there is a non-zero probability that the particle can appear on the other side of the barrier, effectively 'tunneling' through it.

A non-Newtonian fluid is one whose viscosity changes under an applied shear stress. Unlike a Newtonian fluid where viscosity is constant, its flow properties are not described by a linear relationship between shear stress ([latex]\tau[/latex]) and shear rate ([latex]\dot{\gamma}[/latex]). This dependency can manifest as shear-thinning (viscosity decreases with stress) or shear-thickening (viscosity increases with stress).

普朗克轨迹是白炽灯黑体辐射器的颜色随其温度变化在色度空间中的变化路径。它通常绘制在CIE 1931 xy色度图上，呈现为一条从红橙色区域到蓝白色区域的圆弧。它是定义色温的基本参考。