How can I emit data from main controller to view controller in angular?

I want to create an application in angular.

I have the main controller outside the view and specific controller for view.

How can I emit data from Main Controller to View's Controller (Home Controller)?

I want to execute the function in view controller after emit data from the Main Controller.

I've tried to use - $emit and $on but in my case it doesn't work.

My code for example: https://jsfiddle.net/32hb3odk/7/

Index.html

<div ng-app="myApp">

 <div class="head-part" ng-controller="MainController as main">
 <h1>Header</h1>
 <input ng-click="main.EmitData()" type="button" value="Emit data to child control" />
 <br /> <br />
 </div>

  <div class="view-part">
  <h2>View:
  </h2>
  <div ng-view></div>
</div>


<script type=text/ng-template id=home.html>   
<div>{{home.title}}</div>
</script>

</div>

Javascript:

angular.module('myApp', ['ngRoute'])
.config(['$routeProvider', function ($routeProvider) {

        $routeProvider
            .when('/', {
                controller: 'HomeController',
                controllerAs: 'home',
              templateUrl: 'home.html'
            })
                        .otherwise('/');
    }]);

angular.module('myApp').controller('HomeController', ['$scope',function ($scope) {
        var vm = this;
        vm.title = 'Homepage';
    $scope.$on('EmitMain', function(){
        alert("GetDataFromMainController");
    });
    }]);

  angular.module('myApp').controller('MainController', ['$scope', function ($scope) {

        var vm = this;
        vm.EmitData = function(){
      $scope.$emit('EmitMain');
    }

    }]);

That's because $emit goes up the tree. Use $broadcast instead as it traverses the tree downwards.